Now that Microsoft has opened the doors on WHQL certification for Windows 7, both ATI and NVIDIA have made the grade and received the cert for their most recent driver packages; NVIDIA has respun their latest 185.81 to bear v185.85, and ATI has posted an update to the GPU driver portion of Catalyst 9.4. Links to the new drivers for both companies and all operating systems can be found below.

NVIDIA 185.85 WHQL

Windows 7 x86-32: Here
Windows 7 x86-64: Here
Windows Vista x86-32: Here
Windows Vista x86-64: Here
Windows XP x86-32: Here
Windows XP x86-64: Here

ATI Catalyst 9.4 WHQL

Windows 7 x86-32: Here
Windows 7 x86-64: Here
Windows Vista x86-32: Here
Windows Vista x86-64: Here
Windows XP x86-32: Here
Windows XP x86-64: Here