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Windows slow, or freezing for seconds at a time?

“It's just getting old” is the most expensive diagnosis in computing, because it sends people out to buy a machine when something specific and often cheap is wrong with the one they have. Work through this in order — the first check is the one that matters most, and it takes a minute.

Updated 23 August 2026 · written and tested by Rightek IT Services

What you're seeing

• Boots take minutes rather than seconds
• The machine locks up for five to thirty seconds at a time, then carries on as if nothing happened
• File Explorer hangs opening a folder; programs sit at "Not responding" then recover
• Task Manager shows disk usage pinned at 100% with nothing obviously running

Start here: is the drive failing?

That freeze-then-recover pattern is the signature of a drive retrying a read it cannot complete first time. Windows waits, the drive eventually succeeds, everything continues — and it looks exactly like an old computer rather than a dying one.

Check before anything else:

• Noise. Any clicking, grinding or repeated spin-up on a mechanical drive means stop now, back up, and read the hard-disk guide. SSDs are silent, so this only tells you about spinning disks.
• Event Viewer. Open it and look in Windows Logs → System for warnings from disk or Ntfs. Repeated "The device has a bad block" or controller errors are the drive telling you directly.
• Freezes with no CPU activity. If the machine stalls while the processor is idle, it is waiting on storage, not computing.

If the drive is suspect, everything below is beside the point. Get the data off first.

Fix it yourself — the manual steps

1. Check free space

Windows needs room to breathe. Below about 10% free on the system drive, performance falls off a cliff because paging and update staging have nowhere to go. Settings → System → Storage, then run Storage Sense or Disk Cleanup. Clearing Windows Update Cleanup alone often recovers several gigabytes.

2. Cut down what starts with Windows

Task Manager → Startup. Sort by startup impact and disable anything rated High that you do not need immediately at boot — update helpers, cloud sync clients, launchers. Nothing here is permanent; you are changing when things start, not removing them.

3. Find out whether it is actually busy

Task Manager → Performance while it is misbehaving tells you which resource is saturated:

• Disk at 100%, CPU low. Storage is the bottleneck. Either something is hammering it, or the drive is struggling — back to the section above.
• Memory near capacity. The machine is paging to disk constantly. More RAM is the real fix; closing browser tabs is the free one.
• CPU pinned with nothing open. Something is running that you did not start — see malware leftovers.

4. Let Windows Update finish

A machine that is mid-update is slow by design, and a stuck update can stay that way indefinitely. Check Settings → Windows Update and let it complete. If it is wedged, see stuck on Working on updates.

5. Repair the system files

Open Command Prompt as administrator and run sfc /scannow, then DISM /Online /Cleanup-Image /RestoreHealth if it reports problems it could not fix. Corrupted system files cause slowdowns that look like age.

6. Check the temperature

A processor that is too hot slows itself down deliberately to avoid damage — thermal throttling. On a machine that is a few years old and has never been opened, dust in the heatsink is extremely common, and cleaning it out is free.

7. Then, and only then, consider hardware

If everything above is clean and it is still slow, now the age argument is fair. In practice the two upgrades worth making are a mechanical hard drive to an SSD, which transforms an old machine more than anything else you can buy, and more memory if step 3 showed you were short.

FAQ