How long should Undoing changes made to your computer take?

Most rollbacks finish in 15 to 30 minutes, based on what repair shops see. An older laptop with a spinning hard drive can take close to an hour. Microsoft does not publish a time. Keep the PC plugged in and leave it alone while the drive light is still flickering.

Is it safe to turn off my computer while it says Undoing changes?

Not while it is still working. Cutting power in the middle of a rollback can leave Windows files half written. If several hours pass with no drive light activity and no change on screen, one hard shutdown is reasonable. Hold the power button for about 10 seconds, then start the PC again.

Why does my computer keep saying Undoing changes every time it restarts?

The same update keeps trying to install and keeps failing. The usual causes are low disk space, a broken update cache, damaged system files or an external device. Pause updates, free space, clear the update cache, then run the Windows Update troubleshooter before you let it try again.

Will I lose my files if Windows is undoing changes?

No. The rollback puts back Windows system files, not your documents or photos. System Restore and Uninstall updates also leave personal files alone. Reset this PC with Keep my files keeps your files too, but it removes your apps, so back up first if you can.

Can I stop Windows from undoing changes?

You can stop it by cutting the power, but that is the risky choice. A better plan is to let it finish once, then pause updates for up to 35 days in Settings while you fix the cause.

Undoing Changes on Windows Can Take an Hour. Wait It Out

You pressed Update and Restart last night. This morning the screen is blue. A circle of dots spins. The words say Windows is undoing changes made to your computer, and to keep it on.

Your files are fine. A Windows update failed, and Windows is putting the old system files back. In most cases the right move is to wait. The trick is knowing how long, and what to do if the same screen comes back tomorrow.

What the Screen Means

Windows installs big updates in stages. Some of the work happens after the restart, before you can sign in. If a step fails, Windows does not leave the job half done. It reverses every change it made.

On the HP Support Community, the reply to a stuck owner said the message nearly always means Windows Update failed. In that thread, the laptop battery had died overnight in the middle of an update. The reply blamed the low battery.

The wording changes from one version of Windows to the next.

We could not complete the updates. Then Undoing changes.
Something did not go as planned. No need to worry. Then Undoing changes.

Both mean the same thing. Both end the same way when the rollback finishes. The PC restarts and brings you to the sign in screen, on the old version of Windows.

How Long to Wait

Microsoft does not publish a time for the rollback. Shops that fix PCs every day do.

Dave's Computers, a New Jersey repair shop, says to give it 15 to 30 minutes on most machines. On an older laptop with a spinning hard drive, it says up to an hour. MiniTool says the message usually goes away on its own after about 30 minutes, and should not take more than an hour.

Use this as your clock.

Under 30 minutes. Normal. Walk away.
30 to 60 minutes. Still normal on an older or slower PC. Check the drive light.
One to a few hours. Look for signs of life before you do anything.
Several hours with no change. Time for one hard restart.

The drive light is your best clue. It is the small light that blinks when the disk is busy. Many laptops have it near the power button or on the front edge. Dave's Computers says to keep waiting while it flickers. A light that flickers means Windows is still copying files.

Plug in the charger now. A laptop that dies in the middle of a rollback is the same problem twice. Unplug any USB drives, docks and printers you do not need too. Microsoft lists extra hardware as one of the things that can block an update.

When It Is Safe to Force a Restart

Only force it when the PC has clearly stopped. That means the dots have frozen or the screen has not changed for hours. It also means the drive light has stayed dark or steady the whole time.

Hold the power button for about 10 seconds until the PC turns off.
Wait a few seconds.
Press the power button once to start it.

Do this once, not over and over. Cutting power while files are being written is how a small update failure turns into a PC that will not start.

If it boots to the sign in screen, you are back in business. Skip ahead to the section on stopping the loop, because the same update will try again.

If It Keeps Looping

Some PCs restart, try the update again, fail again and land on the same screen. That loop is what drives most people to search.

The good news is that Windows has a built in way out. Microsoft Learn says the Windows Recovery Environment starts on its own after two failed attempts in a row to start Windows. It also starts after two unexpected shutdowns in a row within two minutes of the boot.

So a PC stuck in a boot loop will usually reach a blue menu that says Choose an option. If you can still get to the sign in screen, you can open the same menu by hand. Select the power icon, then hold Shift while you select Restart.

Get your BitLocker key first. Many newer PCs encrypt the drive. The recovery tools may ask for a 48-digit key. Microsoft says you can find it by signing in at aka.ms/myrecoverykey on another device. It also says Microsoft support cannot get a lost key for you. Write it down before you start.

From the Choose an option menu, try these in order.

Uninstall updates. Select Troubleshoot, then Advanced options, then Uninstall updates. Pick the latest quality update first. If the loop started after a big version upgrade, pick the latest feature update instead. Microsoft's recovery page lists this path.
System Restore. Select Troubleshoot, then Advanced options, then System Restore. Choose a point from before the trouble. Microsoft says it rolls back system files, settings and programs without touching your personal files.
Reset this PC. Select Troubleshoot, then Reset this PC, then Keep my files. This puts in a fresh copy of Windows. It keeps your files but removes your apps. Use it last.

These tools do not always work. In a Microsoft Q&A thread, one owner could not uninstall the update and had no restore points saved. When all three fail, the PC needs a fresh install from a USB drive made on another computer, or a repair shop.

Stop the Update From Failing Again

Getting back to the desktop is half the job. The update that failed is still waiting. Fix the cause before it tries again.

Pause updates first. Microsoft says Windows 11 lets you pause updates for up to 35 days. Go to Settings, then Windows Update, then pick a date under Pause updates. This buys you time to do the rest calmly.

Free up space. Microsoft says an update needs at least 16 GB free on 32-bit Windows and 20 GB free on 64-bit Windows. Check by opening File Explorer and selecting This PC. Empty the Recycle Bin and move big videos to an external drive. The guide on a slow computer covers what to clear out.

Run the Windows Update troubleshooter. On Windows 11, go to Settings, then System, then Troubleshoot, then Other troubleshooters. Find Windows Update and select Run.

Clear the update cache. Old or broken download files can make the same update fail again and again. Microsoft gives these commands. Open Command Prompt as an administrator and run them one at a time.

net stop bits
net stop wuauserv
ren %systemroot%\softwaredistribution softwaredistribution.bak
ren %systemroot%\system32\catroot2 catroot2.bak
net start bits
net start wuauserv

Restart the PC when they finish. Windows builds fresh folders and downloads the update again.

Repair system files. In the same admin Command Prompt, run DISM.exe /Online /Cleanup-image /Restorehealth. Wait for the message that the operation completed. Then run sfc /scannow and wait until it reaches 100 percent.

Update drivers from the maker. Microsoft lists graphics and network drivers as a cause of some update errors. Get them from the PC or part maker's own site. Dell owners can follow the steps in the guide on updating a Dell laptop.

Then try the update again. Go to Settings, then Windows Update, then Check for updates. Leave the laptop plugged in, and let it run while you do something else.

If You Still Run Windows 10

The Microsoft pause page notes that support for Windows 10 ended on October 14, 2025. A Windows 10 PC that keeps failing to update is a good sign it is time to plan a move to Windows 11, or to a new PC.

Back up your files before you try any big fix. The guide on backing up photos and files shows the free ways to do it. If the PC also crashes to a blue error screen with a stop code, read the guide on a computer that keeps blue screening.

Advice to Ignore

"Turn it off and on three times." This old forum tip can get you to the recovery menu. Microsoft says two failed starts in a row is enough. But doing it while the drive light still flickers can damage files. Wait for the rollback to stop first.

"Turn off your antivirus to fix it." Some guides say this. If you try it, turn the protection back on the same day. A PC without protection is a bigger problem than a late update.

"Reset the PC right away." Reset is the last step, not the first. Uninstall updates and System Restore keep your apps. Try them first.

"Set your Wi-Fi as metered." That only slows future downloads. It does nothing for an update that already failed.

From the Inbox

How long should Undoing changes made to your computer take?: Most rollbacks finish in 15 to 30 minutes, based on what repair shops see. An older laptop with a spinning hard drive can take close to an hour. Microsoft does not publish a time. Keep the PC plugged in and leave it alone while the drive light is still flickering.
Is it safe to turn off my computer while it says Undoing changes?: Not while it is still working. Cutting power in the middle of a rollback can leave Windows files half written. If several hours pass with no drive light activity and no change on screen, one hard shutdown is reasonable. Hold the power button for about 10 seconds, then start the PC again.
Why does my computer keep saying Undoing changes every time it restarts?: The same update keeps trying to install and keeps failing. The usual causes are low disk space, a broken update cache, damaged system files or an external device. Pause updates, free space, clear the update cache, then run the Windows Update troubleshooter before you let it try again.
Will I lose my files if Windows is undoing changes?: No. The rollback puts back Windows system files, not your documents or photos. System Restore and Uninstall updates also leave personal files alone. Reset this PC with Keep my files keeps your files too, but it removes your apps, so back up first if you can.
Can I stop Windows from undoing changes?: You can stop it by cutting the power, but that is the risky choice. A better plan is to let it finish once, then pause updates for up to 35 days in Settings while you fix the cause.

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