It's definitely a problem with the driver, did you install the driver that came with the CD or the latest version from the site?, it would be pretty **** hard to get rid of it if you can't even get into safemode. Did you buy another ATI card? You should try a PCI vid card or perhaps Nvidia. If so you might have to reinstall windows. That means a clean install, if your not worry about losing anything you an format and reinstall Windows then if you can boot into the desktop try and install the driver, the newest or previous, whichever one you didn't install.