Does anyone have a clue as to how to get a pci multimedia device driver for win98 se on a compaq motherboard s9064

If you know the make of the device have a look on their website

Many times these non-descript "pci multimedia devices" turn out to be the voice part of modems. Is there a voice/fax/data modem in the machine?

If so, and you don't have the make/model of it, and you don't want to open up the system, then download Everest Home Edition. This freeware program will tell you all sorts of things about your system hardware/software, plus provide links to the various hardware manufacturers websites.