I bought a new Dell Dimension that came pre-installed with XP Home. I own a legal CD-ROM of the full version of XP Professional and would like to upgrade. Can I use the full XP Professional CD-ROM to perform an upgrade of an existing XP Home install or will it automatically do a "clean" install and wipe out all my pre-installed programs, drivers, etc.? I know there are XP Home to XP Pro upgrade CDs, but I don't have one of those, just a full version CD. Any help would be greatly appreciated!