This article onMiniTool Websitewill illustrate possible reasons and solutions for you.
With the help of these methods, you will deal with this issue easily.
Your computers system files and options were not changed.

How to Fix System Restore Failure 0x81000204 in Windows 10/11?
Heres how it works:
Step 1.
TypeRunin the search bar and hitEnterto launch theRundialog.
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Typecmdand hitCtrl + Shift + Enterto openCommand Promptwith administrative rights.
Copy & pastechkdsk /x /f /rand then hitEnter.
If a confirmation message appears, typeYto confirm this action.

After the scanning process is complete, reboot your gadget to see if error code 0x81000204 is gone.
If CHKDSK scan doesnt find any problems for you, you’re free to try the next method.
Wonder using CHKDSK /f or /r to check & fix hard disk errors?

Check difference between CHKDSK /f and CHKDSK /r.
Learn how to run CHKDSK /f /r Windows 10.
Typecmdin thesearch barto locateCommand Promptand right-press it to chooseRun as administrator.
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When the UAC window appears, typesfc /scannowand hitEnter.
Reboot your system to see if error code 0x81000204 is removed.
Try 7 Waysto get possible solutions.

Therefore, running the DISM commands is also a good choice to fix System Restore failure 0x81000204.
Right-punch theWindowsicon, highlight PowerShelland right-punch it to chooseRun as administrator.
Insert the following command in the PowerShell window and dont forget to hitEnter.

If it shows some corrupted system files after scanning, you could carry on next step.
Step 3. fire off the following commands and hitEnterafter each command.
The scanning process will take quite a few moments, like wait patiently.
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Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /RestoreHealth
What is DISM and when do you receive DISM error 1009?
How to remove this error?
Start to look for workable solutions from this article now!

Get more information in this guide -CHKDSK vs ScanDisk vs SFC vs DISM Windows 10 [Differences].
TypeYif there is a confirmation message.
Copy & paste the following commands one by one and hitEnterafter each of them.

If this error code is still there, follow the guidelines below:
Step 1.
RunCommand Promptwith administrative rights, typenet stop winmgmtand tap onEnterto deactivate Windows Management Instrumentation Service.
C:\Windows\System32\wbem
Step 3.
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Right-hit the folder to choose to rename it asrepositoryold.
LaunchCommand Promptas an administrative again and execute the following two commands one by one.
net stop winmgmt
winmgmt /resetRepository
Step 5.

Reboot your gear to examine if it fixes your issue.
Move 1: Boot into Safe Mode
Step 1.
Go toWindows options>Update & Security>Recovery>Restart nowunderAdvanced startup.
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Click onTroubleshoot>Advanced options>Startup options>Restart.
Have you ever seen Windows Safe Mode not working issue?
Do you know how to fix it?

Now, it’s possible for you to read this article to get some available solutions.
Typecreate a restore pointin the search bar and hitEnter.
Click onSystem Restoreand hitNextto continue.
Choose a restore point and hitNext.
PressFinishuntil the restore process is complete.
Step 1. select thegear iconto openWindows Settingsand scroll down in the controls menu to chooseUpdate & Security.
In theRecoverytab, chooseGet startedunderReset this PC.
ChooseKeep my filesorRemove everything.
The former one will remove apps and configs but keep your personal files.
The latter one will erase all the data including your personal files, apps and tweaks.
Windows 10 reset VS clean install VS fresh start, whats the difference?
Read this post to learn them and choose a proper one for OS reinstallation.
As a matter of fact, backing up your PC with third-party backup software in advance is a necessity.
Now, let me show you how to do it step by step.
Move 1: Back up Your PC
Step 1.
Download & install this professional backup tool and launch it.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Step 2.
Click onKeep Trialto enjoy its services for free.
Just hitBack up Nowto back up your OS at once.
Changing the default destination path is also permitted.
Just pressDestinationto choose the one you like.
What do I need to back up my computer?
What files should I back up?
Now, get the answers to these two questions in this post.
Move 2: Restore Your System
Step 1.Build a bootable USB flash drive/DVD/CDwith theMedia Builderfeature inTools.
Boot from the drive/DVD/CD and launch MiniTool ShadowMaker.
Go toRestoreand hit the greenRestorebutton beside the desired backup image.
Choose the backup version you want and hitNext.
Choose the volumes to restore from the selected backup file, tickMBR and Track 0and pressNext.
Choose a disk that you want to restore the system and pressNext.
HitOKif a warning appears.
HitFinishwhen the restoration process is done.
You are not allowed to restore the image to the disk that includes the system image.
I used MiniTool ShadowMaker to create a system backup image successfully and restore it easily.