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Upgrading an older Dell

Inspiron 15 3000 & Windows 11: check the processor, not the model number

Dell’s Inspiron 15 3000 has been the UK’s workhorse budget laptop for over a decade — which is exactly why the Windows 11 question is so confusing. Some models upgrade happily. Some never will, whatever settings you change. And because Dell has reused model numbers, two completely different laptops both answer to “Inspiron 15 3520”. Here’s the 30-second check that settles it for your machine, a model-by-model table for the whole family, and your honest options either way — from a family-run Dorset firm that’s sold and supported Dell since 2001 (independent specialists, not authorised or endorsed by Dell).

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By the 365 Techies team · Reviewed 6 October 2026

Why it’s confusing

Two different Inspiron 15 3520s exist — so the name on the lid can’t answer this

Dell has reused Inspiron model numbers over the years, and the 3520 is the clearest example. There is a 2012 Inspiron 15 3520, built on 2nd- and 3rd-generation Intel processors — a machine that was never eligible for Windows 11 and never will be. And there is a January 2022 Inspiron 15 3520, built on 11th- and 12th-generation processors — a machine that runs Windows 11 perfectly well and is still sold with it today.

Same name on the lid. Opposite answers. This is why the “is my Inspiron compatible?” threads on Dell’s own community forum go round in circles, and why we’re not going to start with a list of model numbers. We’ll start with the one thing that actually decides it: the processor inside your machine.

Households genuinely span both eras — we regularly see one Inspiron sail through the upgrade while its near-identical sibling can’t. Neither owner did anything wrong; they just bought the same-looking laptop a few years apart.

// CHECK IT WITH ME · STEP BY STEP

Check this Dell for Windows 11 with me, step by step

The steps from this guide, one at a time. Tick each one off and it shows the next. Nothing here leaves your device.Last reviewed 6 October 2026

Checking which Windows you have…STEP 1 OF 4
  1. 01Read the processor line

    Press Win+R, type msinfo32 and press Enter, then find the Processor line. An 8th-generation or newer chip passes Microsoft’s floor (read the first digit after the dash, or the first two if it starts 10, 11, 12 or 13: i5-8250U is 8th, i5-1235U is 12th); 7th generation or older (i5-7200U, i3-6006U) fails, and no setting changes that. Our free in-browser Computer Spec Checker at /computer-spec-checker/ shows the same information without opening anything.

    Done that step?

Rather have it done for you? Remote help from £20, or in person across Bournemouth, Christchurch, Poole, Ringwood and the New Forest, with no call-out fee.

The 30-second check

Find out what’s actually inside yours

1. Read the processor line. Press Win+R, type msinfo32 and press Enter (or open Settings > System > About). Find the “Processor” line and look at the number after the dash:

  • 8th generation or newer passes Microsoft’s processor floor (the generation is the first digit, or the first two when the number starts 10, 11, 12 or 13) — an i5-8250U, i5-1035G1 or i5-1235U all qualify.
  • 7th generation or older fails — an i5-7200U or i3-6006U doesn’t qualify, and no setting anywhere changes that.

If msinfo32 feels daunting, our free in-browser Computer Spec Checker reads the processor model for you — nothing to install, one of our free tools.

2. Check TPM. Press Win+R, type tpm.msc and press Enter. “Specification Version: 2.0” means that box is ticked. “Compatible TPM cannot be found” on a Dell usually does not mean it’s missing — it means Intel PTT, Dell’s built-in firmware TPM, is switched off. Tap F2 at the Dell logo to enter the BIOS, go to Security > PTT Security and enable it. Dell’s guidance (knowledge-base article 000189676) lists models like the 3567 as PTT systems — they show no separate “TPM” menu in the BIOS, which catches a lot of people out.

3. Get the official verdicts. Microsoft’s free PC Health Check app gives the final yes/no for your exact configuration. You can also put your Service Tag into dell.com/support and cross-check Dell’s Windows 11 tested list (knowledge-base article 000187485) to see whether Dell tested your model and keeps its drivers updated for Windows 11.

Model by model

A decade of Inspiron 15 3000s: which ones qualify

With the processor rule in mind, here’s how the family shakes out. Dell’s tested list is the “officially supported” column; the processor check above is what Microsoft’s installer actually enforces.

Model (approximate era)Windows 11?
3520 & 3521 (2012–13), 3542 / 3543 (2014), 3552 / 3558 (2015), 3559 (2016), 3565 / 3567 (2017)No. 2nd–7th-generation processors fail Microsoft’s floor, and none of these appear on Dell’s tested list. There’s no setting or part that changes it — laptop processors of this era are soldered to the board.
3573 / 3576 (2018)Mostly no — but check. These sit in a grey zone: run the processor check rather than trusting the model number, and let PC Health Check give the final word. They’re not on Dell’s tested list either way.
3580, 3581, 3582, 3583, 3584, 3590, 3593 (2019) · 3501, 3502, 3505 (2020)Yes. On Dell’s Windows 11 tested list (article 000187485). Still run PC Health Check — eligibility is judged per configuration, not per name.
2021-onwards models, including the reused “3520” nameYes. The January 2022 Inspiron 15 3520 and its successors shipped in the Windows 11 era.

If your model isn’t listed, the same logic applies: processor first, TPM second, PC Health Check for the verdict. Or just call us with the Service Tag and we’ll look it up with you.

The TPM myth

“But mine has TPM 2.0” — why the processor is the real blocker

The Inspiron 15 3567 is the perfect example of why this page leads with the processor. It does have firmware TPM 2.0 built in via Intel PTT — switch PTT on in the BIOS and tpm.msc happily reports version 2.0. Plenty of owners do exactly that and reasonably conclude their laptop is ready.

It isn’t. The 3567’s i5-7200U is a 7th-generation chip, one generation short of Microsoft’s floor, so PC Health Check still says no — and Dell has been clear on its community forum that the model won’t be added to the tested list or receive Windows 11 driver updates. In short:

  • A TPM error is usually fixable — two minutes in the BIOS enabling PTT.
  • A processor fail is not — there’s no chip-swap escape route on these laptops.

If you’re staring at the “This PC can’t run Windows 11” message and want to decode exactly which requirement tripped it, we’ve a dedicated guide: what that message actually means on a Dell.

If yours fails the check

An ineligible Inspiron isn’t suddenly scrap: three honest options

First, the reassurance. Windows 10 support ended on 14 October 2025, but your laptop did not become unsafe overnight. Microsoft’s consumer Extended Security Updates originally ran to October 2026, and free consumer coverage has since been extended to 12 October 2027 — so an enrolled Inspiron still receives security updates today. Whether ESU or replacement is the smarter move is a genuine decision, and we’ve set it out properly in Windows 10 ESU or upgrade your Dell? rather than repeating it all here.

Option 1: keep it on Windows 10 with ESU. Perfectly sensible for a machine that’s doing its job. Enrol, keep updating, and revisit the decision before October 2027.

Option 2: a small upgrade to make its ESU years pleasant. Most of these shipped with 4–8GB of memory and a 5400rpm mechanical hard drive — the slowness you feel is usually the drive, not the laptop being “done”. The 3567, for instance, takes a 2.5-inch SATA SSD (it has no M.2 slot) and has two DDR4-2133 memory slots, officially up to 16GB. An SSD and a memory top-up genuinely transforms one of these for everyday light use — see our laptop SSD upgrade service. Upgrade work is available on request and always quoted first.

Option 3: replace it well. The natural successor isn’t another budget consumer laptop — it’s a refurbished business-grade Dell Latitude from £510, with a brand-new 1TB Samsung 990 PRO SSD, Windows 11 professionally set up and your data moved across, backed by a 12-month return-to-base guarantee — or 5 years on a 365 support plan (from £18.25 a month per computer, with a written Service Report after every visit). Start with our refurbished Dell laptops or the plain-English Latitude 3000 vs 5000 vs 7000 guide. As a Dell reseller since 2001, we can also supply new Dell to order.

And one thing said honestly: registry tweaks that force Windows 11 onto ineligible hardware do exist — but Microsoft doesn’t guarantee updates on unsupported installs, including security updates, so we don’t recommend them for a machine you rely on.

If yours passes

Eligible? Here’s how to upgrade without drama

For a 3580-era or newer Inspiron that passes PC Health Check, the upgrade itself is free from Microsoft — and usually smooth if you prepare:

  • Back up first. Photos and documents safely copied before any major operating-system change — no exceptions.
  • Enable PTT if a missing TPM was the only red flag, then re-run PC Health Check.
  • Update Windows 10 fully and fetch Dell’s latest drivers for your Service Tag before you start — most post-upgrade grumbles trace back to old drivers.
  • Give it time. On a machine still running its original hard drive, the upgrade can take hours — another argument for fitting an SSD at the same time.

Prefer someone to do it with you? We handle Windows 11 upgrades regularly — often in a remote session from £20, and we always call before we connect, so you know it’s us. If hands-on work is needed (an SSD going in at the same time is a popular combination), collection is free across Bournemouth, Christchurch, Poole and Dorset — there’s no walk-in shop, and hands-on work is by collection only. Family-run since 1995, same faces every time, 4.9 on Google.

Different machine in the family? See the sibling guides: Inspiron 15 5000 & Windows 11 and Inspiron desktops & Windows 11 — and for anything else that ails an Inspiron, our Inspiron repair service.

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// GOOD QUESTIONS

Frequently asked

Can a Dell Inspiron 15 3000 run Windows 11?

It depends entirely on which year yours is from. Models from 2019 onwards (3580, 3581, 3582, 3583, 3584, 3590, 3593, then 3501, 3502, 3505 and newer) are on Dell’s Windows 11 tested list. Models from 2012–2017 (3520, 3521, 3542, 3543, 3552, 3558, 3559, 3565, 3567) carry 2nd–7th-generation processors and can’t officially upgrade. Check the processor, not the model name — Dell reused numbers like “3520” across both eras.

How do I check if my Inspiron 15 can upgrade to Windows 11?

Press Win+R, type msinfo32, and read the Processor line: 8th generation or newer passes Microsoft’s floor (the first digit after the dash, or the first two if it starts 10, 11, 12 or 13, so i5-8250U is 8th and i5-1235U is 12th); 7th generation or older fails. Then run tpm.msc to check for TPM 2.0, and let Microsoft’s free PC Health Check app give the final verdict. Our free in-browser Computer Spec Checker shows the processor model if msinfo32 feels daunting.

My Inspiron says “compatible TPM cannot be found” — is the TPM missing?

Usually not. On these Dells the TPM is built into the processor firmware as Intel PTT, and it simply ships switched off on some machines. Tap F2 at the Dell logo, go to Security > PTT Security in the BIOS and enable it — Dell’s knowledge-base article 000189676 covers it. PTT machines show no separate “TPM” menu, which is what confuses people.

Can the Inspiron 15 3567 upgrade to Windows 11?

No — and it’s a frustrating one, because the 3567 does have firmware TPM 2.0 via Intel PTT. Its i5-7200U is a 7th-generation processor, one generation short of Microsoft’s requirement, and Dell has said it won’t be added to the tested list. The honest options are Windows 10 ESU, an SSD and memory refresh for light use, or replacement.

Which Inspiron 15 3520 do I have — the old one or the new one?

Check the processor with msinfo32. A 2nd- or 3rd-generation Intel chip means the 2012 machine, which can’t run Windows 11. An 11th- or 12th-generation chip (such as an i5-1235U) means the January 2022 machine, which runs Windows 11 happily. The lid looks the same either way — only the processor line tells the truth.

Is my Inspiron unsafe now Windows 10 support has ended?

Not instantly, no. Windows 10 support ended on 14 October 2025, but Microsoft’s free consumer Extended Security Updates coverage has been extended to 12 October 2027 — so an enrolled machine still receives security updates today. It’s a breathing space, not a permanent answer, and our ESU-or-upgrade guide walks through the decision.

Can I force Windows 11 onto an ineligible Inspiron with a registry bypass?

The bypasses exist and they do install Windows 11 — we’ll be straight about that. But Microsoft doesn’t guarantee updates on unsupported installs, including security updates, so you can end up worse off than staying on Windows 10 with ESU. We don’t recommend them for any machine you rely on.

Is it worth putting an SSD in an old Inspiron 15 instead?

For light everyday use during the ESU years, genuinely yes. These laptops mostly shipped with 5400rpm hard drives and 4–8GB of memory, so an SSD and a memory top-up (the 3567 takes a 2.5-inch SATA SSD — no M.2 slot — and officially up to 16GB) transforms how one feels. It doesn’t change Windows 11 eligibility, and we’ll say so plainly. Upgrade work is quoted first, on request.

What should I replace an ineligible Inspiron 15 with?

Our honest recommendation is a refurbished business-grade Dell Latitude from £510 — built to a higher standard than a budget consumer laptop, supplied with a brand-new 1TB Samsung 990 PRO SSD, Windows 11 set up and your data moved across, with a 12-month return-to-base guarantee or 5 years on a 365 support plan. As a Dell reseller since 2001 we can also supply new Dell to order.

Do you have a shop I can bring my Inspiron to?

No walk-in shop — we come to you. We offer free collection across Bournemouth, Christchurch, Poole and Dorset, fix most software jobs (including Windows 11 upgrades) remotely from £20, and all hands-on work is by collection. Call 01202 775566 or text 07520 615332, Mon–Fri 9–5.

// Still stuck?

Not sure which Inspiron you’ve got — or what it deserves?

Call 01202 775566 or text 07520 615332, Mon–Fri 9–5. Read us the processor line (or the Service Tag on the base) and we’ll tell you straight: upgrade it, refresh it with an SSD, or replace it with a refurbished Latitude from £510. Remote sessions from £20, free collection across Bournemouth, Christchurch, Poole & Dorset, or meet us at Kinson Community Centre by appointment.

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