My daughter was having porblems with her computer running slow so I scanned it and found that there was a virus, removed it and it was running fine. After a few start ups and shut downs working fine, for no reason that I know of, now it won't start back up. It won't start in any of the safe modes, in the last good configuration it gave a message that there was a config.sys error. I tried a recovery disc and it only gives me 1 option and that is to format the drive, erase all files and so on. Any suggestions where to start would be appreciated!