When i play certain videos, my player will say the file is anywhere from
20-55 seconds long, but in fact they're anywhere from 10 min. to an hour
long. The seek bar will go the 20-55 seconds in length, the audio will keep
going, but the picture will start skipping through every min. or so to a
frame that matches the audio, until the video is done. What do i do?

What file format?
This sounds like you're playing an improperly rejoined MPEG file that needs
to be reindexed/rebuilt.

--
(speaking for myself and doing this in my free time)
See http://zachd.com/pss/pss.html for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
Now Playing: "The Great Gate of Kiev" by "New York Philharmonic" in WMP10.
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"Zander" <Zander@discussions.microsoft.com> wrote in message
news:9D5644C3-DC1C-4ED6-89E6-1795A054876E@microsoft.com...
> When i play certain videos, my player will say the file is anywhere from
> 20-55 seconds long, but in fact they're anywhere from 10 min. to an hour
> long. The seek bar will go the 20-55 seconds in length, the audio will
> keep
> going, but the picture will start skipping through every min. or so to a
> frame that matches the audio, until the video is done. What do i do?