guys, i need help, i have 2000 pro on my laptop, when i put the cd in, i can start the installaion and i choose the upgrade, and it does everything fine, then when it asks me to restart, i have the cd in, but when i start the installation, it says it cannot find the cd, although the cd is in the cd drive, i have tried several copies as well, and its for sure not my cd rom drive, any solutions?