mlh,
You may could benefit by running the Win XP compatibility test, go to the MS Windows XP site and download it, other software sites had it up for awhile, an abbreviated ver, can't remember if it was ZDnet, tucows or what.
MS sure did push that test to all who wished to install XP. As noted above, lots of vendors have not debuted any XP drivers, and some may not, as they are under no obligation to do so.