Ultimate Boot CD

So my comp was runnin fine before i went to bed.didnt change a thing.woke up and it is constantly restarting.it keeps crashin on xp loading screen. i get the blue screen error and then it crashes too fast and i cant seem to read the error code. i can boot up into boot cd, but when i try to use anything on the disk it tells me ,

"disk error 20, AX = 4212 Drive EF"

and so now im stuck

any takers on this one???

forgot to add that it was an isolinux error