I find with WMP I just install Divx and Combined Community Codec Pack (for x264 movies, also I find it faster than any other codec I've tried) and I'm ready to go. Oh yeah, also install AC3 so it's really not that much of a fuss.
Once it's configured and you are ready to hand it back to him, make sure to create a backup image of it and put it somewhere safe. It will save you a lot of time in the future in case it does get screwed up. Trust me, you will thank yourself one day for having it.
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