Hi. I decided to start fresh and install a new main hard drive. My older hard drive was slow and so I thought it was time to start over. Only when I installed the new hard drive and inserted my windows installation disk(the same I used for my older drive) , my product key wouldn't be recognized. Does it have something to do with my older drive? Do I need to uninstall windows from the other drive before installing it on this new one? Sounds rather silly but I don't know why my key wouldn't be recognized...