Hello,
What is the exact error message you have got?
- Try to uninstall the third party antivirus software temporarily if there is any one installed.
- Since you have tried to resize the reserved partition, try to resize a more larger size than 250MB such as 500MB.
- For advacned troubleshoot, we could check the C:\Windows\Logs\CBS\CBS.log for more information.
Best Regards,
Hania Lian
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.