Sound like you may have a corrupted account. Try and create a new one like this:
Press Windows key + X and select " Command Prompt (Admin)"
type in the prompt " net user Username Password /add
Replace the "Username" , and" Password", with something of your choice
This would be mine, for example net user David abcd1 /add
now enter and you should see "The command completed successfully"
Type exit to close the command prompt, and restart the computer.
Log in to your new user name (Dont forget the password your have chosen!)