I have windows xp proffesional and I wanted to downgrade to windows 2000. I've checked and I have a basic disk so I should be able to install it on another partition. When I try to install it I get an error saying something not being able to install on current version of windows. I also remember hearing somewhere that you can't install a previous version of windows if you have XP. Just wondering if there is some possible way of doing instead of formatting my drive.