Hold on, you are installing them from the disk and website? You can only do one, did you install from the disk and upgrade from the website for the latest drivers?
Are you getting BSOD during the INSTALL or DOWNLOAD from the website? If you having problems from the website, just use the disk and install the drivers the card came with. Their control application (ATI Catalyst or nVida GeForce) should be able to check for updates after the original install.