I have an original retail version of Windows XP Home Edition. I believe this is my third or fourth reinstall with this CD of Windows and the Serial it brought with it. I only have used this Windows on two PC's, and only once on one of them. Now i reinstall Windows XP and everything is alright, but when I try to activate Windows (through the Internet, not telephone) it tells me that the number of times i can activate Windows with my serial has exceeded. I thought I could reinstall as many times as I wanted as long as I used an original copy of Windows XP. Can someone help me out here and tell me whats happening. Though I was considering buying Vista, I better wait to have a computer with the recommended settings to get the most out of it. I dont want to buy another copy of Windows XP. Please Help!