I can't help with the problem but I can confirm that I have the identical problem
*Upgraded from 2003SE
*Movies are converted to WMV
*Video stutters and audio is a few seconds ahead.
I've done a few tests to try determine what the issue might be but no luck.
*Tried testing testing at many different audio and video rates down to the lowest possible rates (60kbps and so on)
*Tried closing all other programs that were open using task manager
*Tried moving the file from my SD card onto the Himalaya (suspecting the SD was not able to be read fast enough). This WORKED for the first replay, but went back to its normal stuttering directly after.
I've been trying to recreate that ONE time when it worked, but with no luck.
I can confirm that between the working time and non-working time, I didn't install anything, and I doubt I changed any settings, though can't be sure.
Anyway, maybe you can try a few of the things that I did. In your case, it may work.