If I upgrade XP to Windows 7, can I delete XP Afterwards
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Currently on my laptop, I have a legit copy of Windows XP, Windows Vista(laptop originally came with this), and Windows 7 Release Candidate(good until maybe April '10?). Anyways, I am wanting to buy a Windows 7 Home Premium Upgrade, and install it onto my laptop. Question I am wondering(assuming I have Vista/Windows 7 RC already removed), if I do a Windows 7 upgrade from my Windows XP, would I be able to remove Windows XP completely after 7 is installed?

Additional question, if a 'non-legit' copy of windows xp pro is installed on a computer, would a windows 7 upgrade work with that non-legit xp? Just wondering because my neighbors have the non-legits on their computers, and I know they were thinking about buying windows 7 as well, but they are thinking of upgrades since those are cheaper than full version dvd's.