I've just done a fresh install of Ultimate x64 and can't solve one problem with my audio. I am using a 6.1 surround sound system (Onkyo HT-R520) but putting 5.1/7.1 sound into it from Vista. The problem is that the sound from the front center channel goes straight to the rear center instead in both configurations.
When I was running the 32-bit version of Vista Ultimate, it never had these problems. I was always able to get 5.1 sound out of the proper speakers.
Any ideas on what's happening or how to fix it? The rear channel isn't needed, but I sure would like to have my front center back!