It could be this simple. Install the video card drivers. You may find them on some CD that came with the machine or from hp.com
As to XP. I'd not do this because you need to research hp.com and see if HP notes if the machine will run XP. Some don't.
Grandsons computer... HP pavilion, came with win98. Don't know any more about it.
Royally screwed up, he did not have firewall or antivirus.
Computer so messed up, couldn't get on internet, kept locking up, running very slow for over a month.
Decided to use the HP restore disk and that reformatted and reinstalled win98 and other software that came with the hp computer.
Everything worked fine except... monitor, which was fully functional before the reinstall, now has only 2 color & 15 color, and ONLY 640 by 480 resolution.
He is not on internet now and is waiting for DSL modem to be mailed to him so internet is not available to him at this point.
Tried to get windows to search for better monitor drivers, but could not improve the monitor resolution, still 640 x 480.
Monitor is AOC Spectrum 7F. Don't understand why monitor worked in all settings before and now after reinstall, not working properly.
ANY suggestions on how to change the resolution to higher numbers before he gets back online?
After getting online again, he WILL have AVG and Zone Alarm, Spybot and Ad-Aware!
With HP having OEM windows 98, can he buy the XP home upgrade and install it in the HP pavilion, without having any problems?