Hi, thanks for your response. I actually did have it running on Windows 7 - after Trevor said earlier in the thread that the virtual pc wouldn't run it properly, I had uninstalled it from the virtual computer and installed the beta version of DirectRT on the actual computer in Windows 7. That didn't work, so then I tried the official release 2008 version of DirectRT for Windows 7/Vista, and am getting the same problems. That being said, after reading your post, I thought maybe the virtual machine was somehow still interfering with it, so I uninstalled XP Mode and tried running DirectRT again (again, in Windows 7) and still the same. Do you think it would make a difference to try the 2010 version of the 7/Vista compatible software, or no?