I am trying to reinstall Windows Vista for a desktop (Acer Aspire AST180) for a friend of mine. I have the genuine disc and the activation key COA sticker is also available. When I enter the activation key I get an error "The Windows Vista Home Basic product key you typed is invalid for activation". I have double checked the key codes and I am typing in the correct code all the time. I know this computer is too old, but they need it just to make homework for college and school.