|Page Faults are a rather nebulous kind of error.|
It might help if you told us what you were doing when you received the above mentioned error.
I know you have Windows 98, but what about your Excel Version? 2000? 2003? 2007?
You could try re-registering Excel, from your desktop:
1. Start - Run - type 'excel.exe /unregserver' no quotes, click OK
2. Start - Run - type 'excel.exe /regserver' no quotes click OK