I've used this once to get in and create a new spare admin account. It's very advanced but Windows 7 is quite old so I bet you know what to do next.
When I try to log on to my administrator account I am welcomed with this message "The user profile service failed the logon. User profile cannon be loaded. I am currently using a guest account and when i try to do anything that requires the administrator password it tells me windows cannot find the file. For example if i open cmd it is fine, if i run it as administrator i get this message "Windows cannot find 'C:\Windows\System32\cmd.exe'. Make sure you typed the name correctly, and then try again". I tried using the windows recovering system and it has crashed every time so my best guess would be there is corruption in windows but i am not too knowledgeable in this area. I do not want to have to reinstall windows as my internet is extremely slow and i have a download speed of 0.3mb so redownloading all of my games and drivers will take a long time. If you have any idea of how i could fix this it would be extremely appreciated.