well the thing was that we made the guest account and nobody wanted to be assigned as administrator, so in the early days that we got the computer, it let us assign the administrator to the guest, and we were oblivious to the fact that it would cause a problem. So if I try going to User Accounts in the Control Panel on any of the other 3 user accounts it will not let me switch any of them to administrator AND it will also not let me create a new account because it asks me to name the account, and i type in a name as simple as "sun" (without the "") and it tells me that the name is invalid.