Bought new speakers and having trouble with Crysis.

I just bought the Logitech X 540 5.1 speakers for my PC and everything works fine except Crysis. I have an E8400, 4 GB of DDR2, and a 4870 1 GB ATI card. Before I put my speakers up and switched to 5.1 surround sound, I played on Ultra High settings with 30-40 FPS. Now when I play Crysis, I still get 30-40 FPS according the FPS tracking thing in the console command, but it's really glitchy at times, and it slows down, like slow motion is the best way I can describe it, but the FPS stays the same. Like if I move at times, I move real slow or shoot someone, they fall down super slow, where before my 5.1 speakers, everything was normal. I also tried downloading the realtek High Def. Audio Drivers, but once I restarted my PC after the set up process, Realtek is no where to be found. I tried this multiple times.

I'm running Windows 7 beta, and Crysis is the only game that's acting weird on me since I got my new speakers. Also, if I disable my speakers, Crysis works normal again. So it has to be something with the speaker set up.

Can anyone tell me what's going on or how to fix this?