Drivers drivers drivers
This is worth using if you are completely stuck- Driver Guide
at - joining is free, but you need to hunt around for the right drivers.
PCI Communication Device - is a PCI dial-up modem fitted? If so what type - 'generic' drivers sometimes work
PCI Ethernet Controller - likewise?
Multimedia Audio Device - depending on the processor/mobi (I guess if it is W98 it is basic?) there could be an onboard sound chip?
When on line, don't forget all the MS updates!