I'd like to know this too. I wish video players had the option to fastforward/rewind the audio a bit in the middle of watching a movie so I could at least resync it myself.
Play around with Virtual dub. For a constant offset you can delay the audio or have it come in sooner (audio -> interleaving). A progressive offset is often the result of different length audio and video streams, you can match the framerate to fit the audio length (video -> framerate), or if they're the same length you can play around with cutting out some audio (or adding some) and then changing the framerate to match. For audio editing I like Audacity. Be aware that upon opening Virtual Dub the video is set to full processing mode by default. For doing what I described you want to set it to direct stream copy.
You need a better sound card, one with hardware timers (crystal-based) are the best. Onboard (CPU-driven) sound, generally has serious timing problems, because the timers are emulated in software, and depend on the CPU load at any given moment.
If you just want to adjust it while you watch, Media Player Classic (not Microsoft) will allow you to do that. The filters ffdshow, Matrix Mixer, AC3Filter can also do it. All of these are at sourceforge.com.
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