A:Our newest lotto program, Filtering Full Wheel Generator, and the newest version of Full Wheel Generator are Windows programs that will run on 32-bit AND 64-bit versions of Windows XP, Vista, and 7. Our other programs will run as a DOS application on Windows XP, Vista, or 7 32-bit only. For Windows 7 Professional, you should be able to run in XP mode, which is 32-bit and will therefore run the programs. If you have 64-bit version of XP or Vista or non-Pro 7, these programs are not able to run without help. See more information about how to get the programs to run in 64-bit Vista.