If you want to run Virtual PC 2007 on Windows 8 or higher, change the setup file's name to something else, do the same thing for the program's executable. If you're running the x86 version of Windows 8 - 10, you don't need to do anything else. However, if you use x64 8/8.1, you also need to replace VMM.sys in your C:\Windows\System32\drivers folder with this updated version. This does not work on the x64 version of Windows 10, only the x86 version. It also does not work at all on Windows 11.