Microsoft is stopping support meaning it would no longer receive new security updates, leaving millions vulnerable to hackers after October 14
An estimated 21 million PC users are being urged to take action within six days, as consumer watchdog Which? warns of potential risks due to Microsoft ending support for Windows 10, meaning it will no longer receive crucial security updates.
This is a significant concern as cybercriminals are continually evolving their tactics, which are typically countered by operating system updates, leaving millions at risk after 14 October.
Which?is urging Windows 10 users to act swiftly to avoid security threats, as new survey data reveals that a quarter of people with a device running Windows 10 plan to continue using the operating system even after support is withdrawn, reports Wales Online.
A vast number of individuals could be impacted when support ends: based on a nationally representative survey conducted in September 2025, Which?estimates that 21 million people in the UK still own and use a laptop or computer running Windows 10.
Alarmingly, Which? discovered that a quarter of people (26%) using Windows 10 intend to keep using it after updates stop – potentially leaving them exposed to future security attacks and scams.
Two out of five (39%) said they planned to upgrade their existing device to a newer version of Windows, one in seven (14%) said they’d replace their computer, 6 per cent would switch to an alternative operating system like Linux, 4 per cent had other plans and one in ten (11%) were unsure.
Cyber crooks and fraudsters frequently target outdated software to exploit vulnerabilities and pilfer personal information, prompting the consumer watchdog to urge users to take immediate action to maintain their security.
Those whose PCs are compatible with Windows 11 can presently upgrade from Windows 10 at no cost. Making the transition is straightforward, and users should find Windows 11 largely recognisable.
For those uncertain about their computer’s compatibility (many older machines won’t qualify), Which? offers a complimentary tool to assist with verification.
Lisa Barber, Editor of Which? Tech, said: “Our research suggests millions of people may be unprepared for the phasing out of Windows 10 next week. If you have a home laptop or PC running Windows, now is the time to check which version you’re using and if it’s Windows 10 or older, make a plan of action.
“If you don’t act, you could become more vulnerable to hackers and scams. Luckily, in most cases there will be a free and easy solution available to you – whether that’s upgrading to Windows 11, or, if your computer is older and not compatible, opting for the one-year free extension to Windows 10 as a temporary measure. After this you can either switch to a different, free operating system such as Linux, or buy a new device compatible with the latest version of Windows. The Which? website has free, step by step advice to make the transition simple.”
Which? has advised that if you’re unable to upgrade, the next best step is to utilise a free one-year Windows 10 extension offered by Microsoft as part of its Extended Security Updates (ESU) programme. This will provide users with some breathing space to consider their long-term alternatives, whether that’s switching to a different operating system, or purchasing a new computer or laptop that runs Windows 11.
Importantly, the one year extension won’t occur automatically – users must opt in. You can enrol for free if you agree to back up your Windows settings to OneDrive.
Alternatively, you can redeem Microsoft loyalty points (if you have earned any), or pay a one-off fee.
If you’re prepared to transition to a new laptop or PC, then it’s also worth considering what to do with your old one.
Which?’s survey revealed that seven in ten people (72%) are unaware that under the Waste Electrical and Electronic Equipment directive, the retailer is obliged to assist you in safely and responsibly disposing of your old computer if you’re purchasing a new one – so it’s definitely worth remembering this if your old device is no longer needed.