Hrm...seems to me like that could be just about anything. Have you flashed/tried the latest BIOS? Are you sure all your voltage settings are correct? What about PCI and AGp dividers? Did you swap your old mobo out, in order to use the P3B-F? Cause Win98 absolutely HATES it when you replace the mobo, it generally screws it up pretty badly, and requires a reformat. That's all that immediately pops to mind...anyone care to add?
"In the computer industry, there are three kinds of lies;
lies, damn lies, and benchmarks."