I don't know anything about the audio output on your computer, but the best method would be to get a soundcard that is going to let you connect it via coax digital, or optical output.
Most decent motherboards nowadays have the appropriate outputs on them wihtout having to buy a separate sound card, but I am not sure about yours. Check to see if there is an output labelled "spdif" or digital out.
If so, you can run a mini jack adapter to a coax digital cable and run that into a receiver.
I use this setup on both my computers at home. One upstairs uses a 5.1 setup and has a 71 inch DLP running as my second monitor, and the one I am building downstairs uses a 120 inch screen running off of a DLP projector, and I have a touchscreen LCD monitor I am using to run an MP3 jukebox and to keep an eye on security cameras. It is a full 7.1 setup.
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