AMD released a Vista 64-bit hotfix for the new 3DMark Vantage benchmark a few days ago and has recently released it to the general public.
AMD told us that certain Radeon graphics card configurations have some issues under the new 3D benchmark using Catalyst 8.4 drives. 3DMark Vantage Hotfix promises to fix the bugs and also improve performance. Some media are claiming an 800 - 1000 point increase in 3DMark score but we haven't been able to confirm that with our own testing yet.
Keep in mind while the drivers supposedly offer big improvements, AMD say that corruption may still be seen in GPU Game Test 1 when running 3DMark Vantage on "High Settings" on certain ATI Radeon HD 3870 CrossFire configurations under Windows Vista 32-bit edition. Everything should be back to normal by the Catalyst 8.5 as the Futuremark lineup of benchmarks aren't just a two-bit collection of 3D tests.
Go grab your 32-bit or 64-bit Vista drivers over here. There is no Windows XP driver of course since Vantage is Vista only.