Running XoloX 1.12 on WinXP Pro with NO problems. I did have to download a new hostlist.txt file when I started for the first time to get connected, but that was it. (I'm not counting the little display problems as bugs. Such as not being able to adjust the size of some of the columns, and other little things I could care less about.)

P.S. I found a great program to customize WinXP, it even has an auto-RAM recover option that's very handy. It's called Customize XP 1.0.2, you can get it here http://www.tweaknow.com/ This program is not free, but I'm sure you could track down the code if you're too cheap.