When a user boots Windows 7, is there a way to only show a single user that then asks for a password. For example, I have an admin user and a regular user. When the computer boots I do not want the user to see the admin account. Is this possible? If so, how would an admin then login?
Yes, it seems you can hide the account following guidelines explained at Microsoft Technet forums. However you can't login then unless you set the registry key back.
If you want to show it again you have to enter
Alternatively, you can see the answers from this post: "Hide account from login screen but can be used in UAC"