You may see the following message: Working on update 100% complete.
Dont turn off your PC.
This will take a while.

and you will be stuck on the Windows update screen.
If it is still stuck at the interface, you could try the methods below.
What is Alienware Command Center?
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How to download, install, and uninstall it?
This post provides a step-by-step guide for you.
Step 2:Enter the BIOS.

Step 4:ClickRepair your computerto enter into WinRE successfully.
Now, it’s possible for you to continue to enter Safe Mode.
Step 1:From theChoose an optionscreen, click theTroubleshootoption.
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Next, clickAdvanced options.
Step 2:Click theStartup Settingsoption.
Step 3: Click theRestartbutton.

Step 4:Then you will see multiple options for startup.
Press theF4key to enable Safe Mode.
Now your PC will restart in Safe Mode.

Windows Update Troubleshooter is a built-in feature designed tofix Windows update errors.
Step 2: ChooseUpdate & Securityand then selectTroubleshootin the left panel.
Step 3: ClickWindows Updateunder theGet up and runningsection in the right panel and then clickRun the troubleshooter.

Then clickApply this fix.
power cycle your setup and then peek if the working on updates 100 complete issue still exists.
If this method cannot fix the error, try the next methods.

Method 3: Rename SoftwareDistribution Folder
The next method for you is to rename the SoftwareDistribution folder.
Step 2:Then go to theServicestab.
Check theHide All Microsoft Servicesbox.

Step 3:Now, click theDisable allbutton, and clickApplyto save the change.
Step 4:Navigate to theStartuptab and clickOpenTask Manager.
Step 5:In theTask Managertab, go for the first enabled system and clickDisable.

Here you’re gonna wanna disable all enabled applications one by one.
After disabling all programs, close Task Manager and clickOK.
Afterward, you’ve got the option to restart the computer to update Windows again.
The steps are as follows:
Step 1:OpenControl Panel.
Click thePrograms and Featuressection.
Step 2:From the left-hand menu, clickView installed updates.
Step 3:Now right-poke the particular update which is causing this problem and selectUninstall.
cycle your PC and the Windows update stuck at 100 issue should be fixed.
I will show you how to run it step by step.
Step 1:ClickRepair your computerin the bottom-left corner to enter WinRE.
Step 2:you’re gonna wanna clickTroubleshootin the popup window to continue.
Step 3:ClickAdvanced optionsto go to the next page.
Step 4:Choose theStartup Repairin theAdvanced optionsscreen and wait for the process to be completed.
Step 1:Enter WinRE.
Step 2:You should clickTroubleshootinChoose an option, and then chooseAdvanced options.
Step 3:ChooseSystem RestoreinAdvanced options.
Now, take a stab at run Windows update and the issue should be fixed.
Thanks to this post, it helped me solve the issue.
It is pretty easy and safe to back up and restore your system.
Step 2:MiniTool ShadowMaker selects the source by default.
Thus, you just need to choose the backup destination.
Step 3:Go to theBackuppage.
ClickBack Up Nowto start creating a system image.
Step 4:Wait for MiniTool ShadowMaker to finish backing up the operating system.
to keep my system safe, I make a backup of it successfully with MiniTool ShadowMaker.
If you come across the same issue, try these solutions.
After fixing this problem, it is recommended you create a system image.