Ah, yeah, I totally missed what he was trying to do at first.Although Hawkian already answered, let me also point out that you're supposed to select Windows XP SP2. You see, you're not selecting the OS you have (Windows is pretty well aware what version it is), but the OS you want to emulate (as Windows has no way of knowing what version the program works with). So Windows 7 is precisely the one option that won't work (XPadder doesn't work on Windows 7).