I'm using MKVmaker to rip my movies. For blu ray, I just select the HD lossless audio (don't hit DTS 3/2 english...). I believe it's recorded in 5.1, just don't know what settings to hit on the windows 7 side. I tried configuring the surround sound, but didn't seem to help. Just get sound coming through left and right floor speaker. All speaker are selected on the receiver.