I have had a touch screen for about 9 months or so, its an HP tx1000. I got it as an excuse to draw in photoshop. It is fine as far as gameplay (reminds me of the touch screen games at the bar). I run Vista Ultimate on it, 64 bit.
I have been seriously thinking of installing XP Tablet edition since I can grab it from MSDN, but if you are having issues I will probably too.