Mike, I don't mean to sound stubborn or anything but that's actually one of the main purposes of runnin OS's virtually. If for any reason you encounter an issue your acual OS (XP in this case) and PC won't be affected. And it will also allow you to test/try-out Zorin OS before formatting and removing XP. Check out;
But if you really want Zorin and nothing more then a clean install of Zorin should be good. No need to partition the hard drive.
EDIT: By the way, I'm downloading a copy of Zorin myslef and about to try it(using VMware). Had never heard of it but it looks cool. Going to see if it's really 'immune to Windows viruses.'
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