Re: drivers compaq presario 5900z
Video and modem driver for Windows 98 can be downloaded from http://h10025.www1.hp.com/ewfrf/wc/softwareList?lc=en&cc=us&dlc=en&product=93649&lang=en&os=20
That would be a good start. Tell what they are, if necessary.
They could be exe (that installs things when run) or zip (needs to be extracted to empty folder, then new hardware wizard needs to be pointed to that folder) or self-extracting exe (like zip, but put it in an empty folder and run to get all the files it contains into that folder). Nothing really difficult.
Don't you have the original restore CD?