It does not, wait it does, well it doesn?t , no that's ok too
1) XP Pro does not 'UpGrade' forcing me to re-install software
I had issues moving from Pro to Vista but ALL were issues with old hwd, HWD issues that I should have corrected long ago and outdated software.
It took a week, but after I looked back had I been running a clean XP machine the only issue I would have had is my TV software (SnapStream), it acted a bit flakey for a while but Snapstream did some tweaking that did the trick.