I am trying to update my video drivers and am unable to get the ATI uninstall utility to work. When I click it in Programs and Features. I get the option to uninstall all ATI software (recommended) or all plus chipset software. I choose first option - a box of technical stuff comes up with an OK button and then the box to reboot to effect changes. But when I reboot nothing has changed. (ATI Radeon HD4800 series.) Vista up to date with all SPs.