I was following these article to do so:
click here of my laptop:-
Operating system: Windows
Windows version: 7
At Step 3, I failed to create a temporary user with administrator privileges through Command Prompt. So, I created it manually through Control Panel with the same exact name and password as instructed.
Then, I proceeded on...
Until Step 6 onwards, problems arise. I changed the username to Default. Step (c) I failed to access the Advanced user management, so I skipped it until Step 7. I also changed the folder's name to Default but it says that there is already a folder named Default existed and asked me if I want to replace.
I then immediately tried to go back to Step 6 and rename it to previous name but failed, so I clicked "Yes" to merge folder and replace the existed folder. At this moment, the only Users folder window frozen. I then realised it happens when I attempted to replace after many times trying.
Also, at the end, I successfully changed back all the names to how previously it was named in Step 6 and Step 7 but I still stuck at user login "Welcome" forever when trying to login to the account I made changes.
Although I made a system restore before doing all these as a precaution, but I fail to restore since I receive an error message saying that it was unsuccessfully maybe due to anti-virus even though I turn off all anti-virus. :(