ACPI setting

[George]

Playback offset may be fine for minor changes but the best method if the audio is out of sync is to change the hardware accelleration setting. It's a more permanent fix(if that's the problem)

Click START

Click RUN

Type DXDIAG, O.K

At the top of the page, click on SOUND 1

About the middle of the page there's a HARDWARE ACCELLERATION slider.

Move it two clicks to the left, and exit.

No harm done if it doesn't solve the problem, you can easily put it back.