slowly or quite fast?
if its quite fast its normally a sign the drivers arnt installed.
There is a program you can use to remove all traces of unused drivers http://www.majorgeeks.com/download3214.html
Uninstall your current drivers, delete anything to do with ATI or Omega Drivers from Add/Remove Programs, run the driver cleaner. After you have done that make sure your chipset drivers are installed then install the latest drivers from eith ati or omega drivers.
Hope this help
(MAKE sure u delete the omega drivers install files, otherwise they will auto install when u reboot and have no dirvers installed.)!!!!!