Why not install VMware or another virtual app on your host computer, then install Linux, etc as virtual guest operating systems so you don't disrupt your host computer's OS. When you are do e with the guest, you simply delete the VM files.
JorgeM
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may be i can download unix, linux on CD or some program that let me do this.
There are distros of Linux (such as Knoppix) that can be run from a live CD. Do a google search for "Linux live CD" and you'll get plenty of hits.
deceptikon
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