questfan,
do any of the kings quests run on windows XP?
I know this question wasn't directed at me, but I do know the answer which I actually pointed out to someone earlier in this thread, but it's gotten so long I wouldn't be surprised if you missed it.
All of the Quest series (Police Quest, Space Quest, King's Quest) and the LSL (Leisure Suit Larry) games were re-released in 2006 (?) as collections that claim they work in Windows XP. What Sierra did was include a custom tuned version of DOSBox, a free DOS emulator. Being a huge Space Quest fan, I purchased the Space Quest collection of course. It runs pretty well. The only issues I had were with an occasional crash of DOSBox (which is still in BETA testing) and my video card doesn't display 320x200 quite right. The pixels should be slightly rectangular and not square. Other than that, I'd say it works pretty well.
If you have an older version of the game and not the collection, you can download DOSBox from
http://www.dosbox.com. It takes a while to learn how to tweak it, but it works well for most old DOS games. I've also run The Dig and Full Throttle in it. Worth a looking.