I've been running it on WinME and after a while it starts to behave erratically and eventualy freeze. Immediately afterwards my WHOLE system starts to freeze. I'm using ver. 1.11 and I think it has a resource leak. If I open Xolox and then minize it to the tray and then restore it a few times (4 times is enough) I notice that my RAM and system resources get used up VERY quickly. I've tried this even with a clean boot and no apps running (using MSConfig) and it still keeps on happening. I know it's not the system because it works fine and I have ALL the latest drivers, updates, and patches.