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So what exactly can you do with it? You can run a completely different operating system in a Window on the operating system that you are currently using. I used it to run Windows XP in a Window on My Ubuntu Laptop. But you could have just as easily run the test drive for Windows 8 on you Vista system, or Ubuntu Linux on your WIndows 7 computer without making new partitions or messing with the instillation that you already have.
It works very well, and you can easily allocate processors in your multi processor computer, how much RAM it will use, and how much graphics memory it will take. Of cource the more RAM and processors you have the smoother everything will run. I'm running it on a dual processor machine with 4 Gig of RAM and it does a good job with allocating 1.5 Gigs to Windows XP.
You can download your version here Oracle VirtualBox.