I'm running Win7 release candidate and I decided to switch out the Asus sound solution for an X-Fi PCIe in the bottom-most slot but ended up having to switch back. It seems Creative's Win7 drivers aren't ready for prime time yet. With them and the card installed, I get crasing with the same BSOD in all games. The BSOD relates to a directx file. I tried re-installing the directx end-user runtime but that didn't help. With the stock soundcard and the default Win7 driver, everything works as it should.