I just came to know the technique (which I was looking for from a long time..) by which we can run Linux/Unix on Windows (through Virtual Machine 2007)..
You can download the ISO images for various linux versions from here,
And configure the Virtual Machine to boot from these ISO images directly! Its easy and every good...
Right now, I am downloading ubuntu (to see why Dell started with ubuntu...) and going to see whats in there.