I changed my user account name and now my laptop is unable to boot up.

Already tried, but no success.

At the confirm disk tab the status shows "you must enable system protection on this device"

So i searched on internet and found that using some comand prompt(Rstrui.exe /offline:C:\windows=active) we can perform a system restore. And i did that but ended with an error.

Details: System Restore failed while restoring the registry from the restore point. An unspecified error occurred during System Restore. (0x80070002)

Also tried reset this pc .But that won't work at all, saying "There was a problem resetting your pc".

Hi Susan;

Do the same steps and when you Click "Troubleshoot" then click "Advanced options" finally click the "System Restore", from their you can select the date to revert your computer's state to that of a previous point in time and recover from system malfunctions or other problems.

Let me know if that works

For further support just download the current file. This file doesn't come with personal support and you will only be able to burn the image. I don't have any sources for USB creating tools right now. And this will provide the same information in the topic with repair functions or not. You can do a fresh install but I don't guarantee licensed transfer.

https://software-download.microsoft.com/pr/Win10_2004_English_x64.iso?t=c3d2ce6a-080d-46e2-9988-204a38f30daa&e=1596951242&h=1d306981dcd883685f08536b9a777005

I can just suggest reading this article. If you are not sure or don't know the fix. Read the article entirely and try to only apply the fix that applies to your problem the most.

https://windowsreport.com/corrupt-user-profile-windows-10/#:~:text=Corrupt%20User%20Profile%20in%20Windows%2010%20%5B6%20FIXES,Windows%2010%206%20Run%20an%20in-depth%20antivirus%20scan

Fix corrupt user profile in Windows 10 in a few easy steps

I keep forgetting to mention that if you have any recovery media available it's also easy to apply CMD features in that load recovery state. Like here;It requires Pressing Shift + F10(or windows + f10) http://www.windowsreinstall.com/winre/repaircommand/index.htm

this is just the best index that i can find anyway

And I know what you are talking about. I hate to learn common CMD mistakes in cases where I break a computer from the common UI. It's not that serious however. There is a reason the Administrator Icons are in place. Right now I am also just required to break computers to get the maintenance routines going. Just don't take that approach to a personal sustainability.

My sticky keys no longer work after making many (failed) attempts to try that route first.