Keep in mind, Window 10 is connected with your user profile and MS Account. When you find the user profile get corrupts, then you should create a backup of your hard disk and create a new account. If the customer requires help in creating account, then visit to the site via office.com/myaccount. 

Method to Fix Corrupt User Profile in Window 10 and 11:

1. Fix Corrupt User Profile:For this, first you have to create a backup of your hard disk. If the user cannot log in to the user profile on startup, then they should restart the computer and just enter the Safe Mode.
   
   When you enter the Safe Mode, you have to visit to Search and then type regedit and just open Registry Editor. If you find the Registry Editor launches, then visit to the following key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
   
   Here, you should tap on each S-1-5 folder and then double-tap on the ProfileImagePath entry in order to find out which user account it is associated with. If you determined the corrupt user profile, then you should double-tap on RefCount and then change the Value data to 0 and hit on OK button. If the user find the value isn’t available, then you should create it manually. Here, you have to double-tap on State and check the Value data is again 0 and then tap on OK. At last, just close Registry Editor and then restart your PC.
   
   
2. Create New User Profile: To fix this issue, you should create a new account and then just transfer files from corrupt account. In case, the user don’t have another account, then they should enable a ‘hidden admin account’. After this, log in to that account in order to create a new user account and then just transfer files from the old user profile.
   
   To enable a hidden admin account, you should restart your computer system and then boot into Safe Mode. After this, you should open Command Prompt. Now, you have to type the below command and tap on Enter:
   
   net user administrator /active:yes
   
   At last, you will get The command completed successfully message. Then, you have to Reboot your computer.
   
   To create a new user profile, you should visit to Settings and then go to Accounts. After this, you should visit to Family and other users. Here, you have to tap on Add someone else to this computer. At last, you should follow the instructions and then complete the creation of new user’s profile.
   
   
3. Perform DISM and SFC scan: The user should open Win + X menu just by tapping on Windows Key + X altogether. After this, you should choose Command Prompt (Admin) or PowerShell (Admin) from the list. If the Command Prompt opens, then you need to enter sfc /scannow and hit on Enter key to run it. At last, the SFC scan will begin and it will take up to 15 minutes.  
   
   
4. Install Latest Updates: First, you should open the Settings app just by pressing Windows Key + I key together. If the Settings app opens, then tap on Update & security. At last, you should hit on Check for updates button.

The above method will help you to resolve corrupt User Profile in Window 10 & 11. If the customer needs help, then you have to navigate to office.com/myaccount.