unistalled my ati driver now winddows 7 doesn't boot up.

I wanted to update my ati 5850 drivers so i uninstalled my previous drivers, and when i restarted my computer it wouldn't boot into windows. it says a recent software or hardware change might be the cause. I tried start windows normally it just restarts after the windows 7 logo.

I am running a ASUS Crosshair IV Formula MB, and 2 western digital black in raid 0 setup please help thanks in advance.

I would reboot and hold down the F8 key and use reboot using last known good configuration.