I had the same error when i updated my drivers from 8.3 to 8.8, i did managed to get it working without that error.
This is what i did and it succeeded (hopefully it will work for you to):
1. run 8.8 installer again and select uninstall, remove everything, restart if asked
2. go into device manager and if it still says that you have ati graphics then right click it and uninstall from there, restart if asked
3. in device manager i had some generic graphics driver now (i believe that installation wont work properly until you manage to clean you system from ATI drivers so that windows selects that generic driver), and i was able to install 8.8 drivers without that error showing up, offcorse restart again after installation
