A high quality external DAC will improve the sound quite a bit. There are two ways to do this. Some PCs have digital SPDIF out. In this case you can just buy any audiophile DAC--something like the benchmark would probably be a good choice. It's pretty inexpensive and works very well. If there is not a digital out, then a USB soundcard would work well. The Creative ones work well, but they are really designed for gaming and surround mostly these days. You would probably be happier with something that just does 2 channel and does it well, such as the M-Audio cards. There's a fasttrack pro and an audiophile. Either of these would probably be good choices.
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