Hello, I installed the Windows 7 RC as a fresh install. I also used the beta version and upgraded it 4 times. Everything was installed and worked, but now i have a problem with virtual pc. I installed the XP mode to try it, but my laptop doesn't have hardware virtualisation, so the XP mode doesn't work. Before i installed the XP mode, virtual pc was working as normally, but when it was installed, virtual pc didn't work anymore. Now i removed both, the XP mode and virtual pc 2007. Now i get this error even before the install I already tryed to disable the program compatibility assistant using group policy, but that didn't work. There are also for some reason no restore points from before installing the XP mode: How can i install and use virtual pc again without doing a reinstall?? Problem is solved! You also need to uninstall the update. This is not listed in the programs, but at the installed update view. I remove the update and now i can use virtual pc again.