1. Rename the profile Directory c:\users\login name i.e Login_Name.bak
2. Run Regedit, find the login name from the sub keys in HKLM\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\ProfileList
and rename with a .bak i.e S-1-5-21….
Look in each one for ProfileImagepath that matches the one you renamed in point 1.
Don’t forget to backup the Registry before you start, as getting this wrong could damage your Operating System.