|Knowing two things might help.|
What type of bios....award,phoenix etc
Do you have an A: drive....floppy?
There is a means to use a 98 boot disk with debug on it.
entering in and running the routine can set the bios back to default.
Yes it can also toast the bios......but you have already done that so there is not much to loose. The bios are in a chip called eeprom. It is unlikely you over wrote the default......If so I would like to know what program you used to do that.
google debug to clear bios........