>>I hit my limit on my XP Pro installs and it's telling me I used up my registration keys. What do I do? I can get a new XP Pro from Ebay for about $130, but can I install it over the current installation? I have lots of stuff installed, utilities, etc and didn't check the activation because I didn't have an internet connection at the time. I know I'm not the first to run into this. Thanks!
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>Call Microsoft they might give you a new key if you explain why you installed it so many times

Do you think "Because I'm an idiot and had to rebuild my OS a number of times." is a good reason? I didn't know they would even consider giving out a new key.