PC won’t start after a Windows update: how to go back and fix it

You installed a Windows update and now your PC won’t start: black screen, a logo that spins forever, a blue screen or endless restarts? Don’t panic: in most cases you can fix it without losing your files, using the recovery tools already built into Windows. This guide takes you through the steps, from the simplest to the most drastic.

First try: the simplest fix

Sometimes the update is still finishing: if you see “Working on updates” or a percentage, wait at least 30 minutes without turning the PC off. If it’s really stuck:

• unplug USB sticks, external drives, printers and docks: sometimes Windows tries to start from them;
• hold the power button for 10 seconds and turn the PC back on.

How to open the Windows Recovery Environment

All the repair tools are in the Recovery Environment (the blue screen with “Choose an option”). There are three ways in:

1. If the PC won’t start: turn it on and, when the Windows logo appears, hold the power button until it switches off. Do this 3 times: on the fourth start you’ll see Automatic Repair. Click Advanced options.
2. If you can reach the sign-in screen: hold Shift and click Power → Restart.
3. With an installation USB: start the PC from the Windows USB and choose Repair your computer instead of Install.

Then go to Troubleshoot → Advanced options: you’ll find all the options below there.

Is it asking for a BitLocker recovery key?

If the disk is encrypted, Windows may ask for a 48-digit BitLocker recovery key. You’ll find it by signing in to your Microsoft account from another device, under Devices → BitLocker recovery keys. Without this key the disk can’t be opened, so always keep a note of it.

Fix 1: uninstall the latest update

This is the fix that works most often. In Advanced options click Uninstall Updates and choose:

• Uninstall latest quality update: for the monthly updates (the most common case);
• Uninstall latest feature update: if you’ve just installed a new version of Windows, such as 24H2.

Windows removes the update and restarts. Your files and programs stay where they are.

Fix 2: Startup Repair

In Advanced options choose Startup Repair: Windows automatically checks and repairs the files it needs to start. It takes a few minutes.

Fix 3: System Restore

If Windows created a restore point before the update (it almost always does), you can take the system back to that moment. In Advanced options choose System Restore and pick the point dated before the update. Your documents aren’t touched: only programs, drivers and settings installed after that date change.

Fix 4: start in Safe Mode

Safe Mode starts Windows with the bare minimum: useful when the problem is a driver (often the graphics driver or an antivirus).

1. In Advanced options choose Startup Settings → Restart.
2. When it restarts, press 4 (or F4) for Safe Mode.
3. From here you can uninstall the suspect driver or program from Settings → Apps or Device Manager.

While you’re there, open Command Prompt as administrator and repair the system files with these two commands:

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

The PC starts, but something’s wrong after the update?

If you installed a new version of Windows less than 10 days ago, you can go back to the previous one from Settings → System → Recovery → Go back. Afterwards, pause updates from Settings → Windows Update → Pause updates for a few weeks, until Microsoft releases a fix.

Last resort: reset the PC

If nothing has worked, in Troubleshoot choose Reset this PC → Keep my files. Windows is reinstalled from scratch but your documents stay; you’ll just need to reinstall your programs.

Windows reactivates by itself with its digital licence. If it shows as “not activated” after reinstalling, follow the guide Windows not activated? How to fix the errors.

How to stop it happening again

The best way to stop worrying about updates is a full PC backup: if something goes wrong, you restore everything as it was in a few minutes. With EaseUS Todo Backup you can create a full image of your disk and an emergency USB to restore it even when Windows won’t start.

See EaseUS Todo Backup Home

Frequently asked questions

Does uninstalling the update delete my files?

No. Uninstall Updates, Startup Repair and System Restore don’t touch your documents, photos or other personal files.

Will Windows install the same update again?

It can. That’s why, once it’s fixed, you should pause updates for a few weeks: in the meantime Microsoft usually fixes the problem.

Do I have to buy the licence again if I reinstall Windows?

No. The licence stays valid and Windows reactivates on the same PC. If needed, you can enter the product key again from Settings → System → Activation.

Still stuck? Message us with a photo of the screen: we’ll help you work out what to do, for free.