"Want to run more than one copy of Windows on your PC, or run an older version while Vista happily hums on your new machine?" Microsoft has released a new version of Virtual PC 2007 and it's free! What is it??? It will allow you to run an image of other operating systems under Vista. Why would you want to do that? Well, if you have issues with key applications that you need to run and they run fine under Windows XP or OS/2, you can run in a virtual machine on your vista desktop. Perhaps there is a game on XP or corporate application on OS/2 that you'd like to run while also running Vista, you can do it with Virtual PC. You'll need some memory in your machine to do it though, the recommendation is a minimum of 128MB for Windows XP and 512MB for any version of Vista.

You can get it right here.