I already posted one in cpu's, so I'm obviously very new. I'm building a computer soon, my first. I'm considering using the hard drive from my current dell. It's got win2k installed, and it's the only hard drive I have. (will soon have external firewire drive, but that's not the issue.) If I use this drive to build my new computer, will I need to format it and reinstall win2k again? (I'd have to buy it again, I think, cause Dell OS's check for manufacturer. so, I might have to go with XP.) OR, can I just pop it in and let the os figure out the changes?