Hello again! While trying to reinstall over a system failure on Windows XP Pro, I've tried to use the sticker on the bottom of my laptop to reinstall Windows XP, but it keeps rejecting my key! After several attempts, it keeps rejecting that sticker key. This pre-installed laptop came with no CD and case. Do you think it would be safe, seeing how I plan to do so, buy Vista Ultimate and install it over the same partition? I noticed, while reinstalling XP Pro, my hard drive contents were in tact. I was hoping Vista Ultimate would let me install over my XP Pro, though I'm currently unable to use my product key. Any ideas?