Cannot log in, computer goes back to login screen repeatedly

I am on a Gateway desktop that runs Windows 7. Tthere are three user accounts as my family shares this computer. My husbsnd is the administrator and my account is a work account with client files that I need for work.

Yesterday the computer worked fine, my husband played WOW on it last night which was the last program run. There have been no recent chsnges either.

Todsy , when we try to log in on any of the accounts the computer will flash the words "logging off" and then it will go back to the login screen. I have tried going to the safe mode, safe mode with command prompts and neither will allow me to log in. I have tried going to the BIOS but there was no option there that allowed me access either.

Since windows came preloaded we don't have a recovery disk and reinstalling windows is jot an option due to my work files.wr really need some help asap, please. It will be greatly appreciated.

Thanks
Trinittie at smrfina at ya who