A PC that keeps freezing on Windows 11 is one of the most frustrating faults we see at our Edinburgh workshop — the cursor stops dead, the fan winds up, and nothing you click responds for thirty seconds at a time. It happens to brand-new gaming rigs in Leith just as often as five-year-old laptops in Morningside, and the cause is rarely obvious from the freeze itself. This guide walks you through the same checks we work through in the shop, ordered from the quickest software fixes to the deeper hardware tests.
If your machine has already become unusable and you'd rather skip straight to a hands-on diagnosis, our software troubleshooting team can take a look the same day.
First, Work Out What Kind of Freeze You Have
Not every freeze is equal. Before you change anything, pay attention to the pattern. Does Windows 11 lock up only when a particular app is open? Does the mouse still move while the screen is frozen, or is everything dead? Does the machine recover after a minute, or do you always have to hold the power button? These details narrow the cause down enormously — a mouse that still moves usually points to a hung application, while a completely dead system more often points to drivers, storage, or overheating.
1. Try the Ctrl + Alt + Delete Reflex Before You Reboot
When the screen first locks, give it about thirty seconds, then press Ctrl + Shift + Esc to open Task Manager directly. If it appears, sort by CPU and Memory and look for one process pegged at 100%. Ending that single app is far gentler than yanking the power, and it tells you which program is the trigger. Browsers, video editors, and OneDrive sync are the usual suspects. Our guide on using Task Manager on Windows 11 covers what to look for in more detail.
2. Update Windows and Your Drivers
An outdated graphics, chipset or storage driver causes more Windows 11 freezes than any other single thing. Open Settings > Windows Update and install everything pending, including the Optional updates section, which is where most driver updates hide. Then visit your GPU vendor's website (Nvidia, AMD or Intel) and grab the latest display driver directly — Windows Update's version is often months behind. We see this fix on roughly one freezing PC in three at our Penicuik callouts.
3. Test Your RAM
Faulty memory is the classic cause of random, app-agnostic freezes. Type "Windows Memory Diagnostic" into the Start menu, choose to restart and check now, and let the test run for at least one full pass. If any error appears, you've found it. For a deeper test, our walkthrough on testing PC RAM for faults covers MemTest86, which is what we run on bench machines overnight.
4. Check Your Drive's Health
A dying SSD or hard drive will freeze Windows whenever it tries to read a bad sector. Open PowerShell as administrator and run Get-PhysicalDisk | Select FriendlyName, HealthStatus, OperationalStatus. Anything other than "Healthy" and "OK" is a red flag. For SSDs especially, download a tool like CrystalDiskInfo and check the SMART status — if you see "Caution" or any reallocated sectors, back up immediately. Our piece on SSD failure signs goes further on what each indicator means.
5. Watch CPU and GPU Temperatures
When a processor hits its thermal limit, Windows 11 will pause the system to let it cool, and that pause looks exactly like a freeze. Install HWInfo64 and watch the temperatures during normal use. Anything above 95 °C on a CPU or 85 °C on a GPU under light load points to dust, a failed fan, or dried thermal paste. A tower PC that hasn't been opened since you bought it in Dunfermline is almost certainly clogged inside; a re-paste and clean usually solves it.
6. Scan for Malware and Background Hogs
Cryptominers and adware sit happily in the background eating CPU cycles and triggering freezes you cannot explain. Run a full scan with Windows Security, then a second-opinion scan with Malwarebytes. If anything is found — or the freezes coincide with a recent download — book our virus and malware removal service for a proper clean. We've pulled background miners off customer laptops in Livingston that had been blamed on "old hardware" for months.
7. Reset Windows as a Last Resort
If drivers, RAM, disk and temperatures all check out, the operating system itself may be corrupted. In an admin Command Prompt run sfc /scannow followed by DISM /Online /Cleanup-Image /RestoreHealth; these repair the system files Windows uses on boot. If freezes still persist, a clean reinstall is faster than chasing ghosts — see our clean install Windows 11 guide for the safe way to do it without losing personal files.
When Freezes Mean It's Time to Call a Technician
Some freezes need eyes on the hardware. If your PC freezes during BIOS or before Windows loads, if you hear a clicking drive, or if the freezes are paired with random reboots, the issue is almost always at the component level — RAM modules, the motherboard, or a failing power supply. If you're not comfortable opening the case, or you've worked through the steps above without joy, our hardware upgrades and diagnostics team covers Edinburgh, the Lothians and across to Livingston with same-day appointments.
Stop Guessing — Get a Proper Diagnosis
A Windows 11 PC that keeps freezing is rarely "just old". There's almost always a specific cause and a specific fix, and the longer you leave it the more likely it is that a failing drive starts taking your data with it. If the checks above haven't settled the issue, bring your machine in or use our home and office callout service and we'll find the root cause without the guesswork.