dlo@questor.wimsey.bc.ca (David Lo) (07/17/90)
If something in the boot sector is different, then it certain doesn't hurt to look through it. However, your explaination of a SYS with another version of DOS is possible. It is also possible that a buggy program wrote something into the boot sector. If there are sensitive or important data, back them up, put a clean DOS back on the hard disk, and hope for the best. The more you try to play with a possible virus, the more likely it'll do some harm.