"A virus in the boot up file".
Do you know any details, such as the name of the virus and wbat 'boot up file'?
"Old Win 98".
What's old Win 98, and especially, what else do you boot in? A 'new Win 98', XP? Dual boot system?
What happens if you boot from a boot diskette with cd-support, note the drive letter assigned to the cd-rom (say d: or r: ) and do dir d: (or dir r: ) - with a CD-ROM in the drive, of course? A DOS-error message could be helpful.
The other day I found out that my computer had been infected with a virus in the boot up files. I used AVG to remove the virus, but now windows won't recognize my D drive. Everything else boots up fine. It's still listed in BIOS, and if I start up the computer with old Win 98 everything is fine. Any and all help would be appreciated.