Redo is a LiveCD, that is, it has an OS inside the disc, which means you don't need to boot into Windows to use Redo. Instead, you boot into Redo's built-in OS, then, from there, you do the backup and recovery operations. In other words, you will not install Redo into Windows. So the version of Windows you have is not important. As a matter of fact, you can use the same Redo disc to backup XP, Vista, 7, OSX or Linux. 32 or 64-bit.