Do you have back up copies to test? Recover is usually successful but there are no guarantees.
Account names are not case sensitive. Passwords are. This one's obvious, but in case you didn't check for it: Make sure your caps lock key isn't down while entering the password.
"...opening the *.fp7 file it is telling me the account and password I entered cannot be used to access this file, try again later."
Is not the standard filemaker message for entering the wrong account/password. Any chance this is a WIndows 7 password on the filemaker file or folder? SInce you've installed on a new computer with a new OS, check to see if your user account has the right settings.