Video card drivers - black screen on login screen

Hi,

I updated my ATI HD 5770 drivers today, and rebooted. Afterwards, the login screen sound played, but nothing was visible.

I booted into safe mode and deleted the video drivers and attempted to install some working ones - the same issue occured (Windows Update).

Can anyone give me a hand in finding the correct drivers to install?

Windows 7 HP 64 Bit
ATI Radeon HD 5770

Cheers :)