Echo while watching videos

I'm using an HP Pavilion a1600n, with Windows XP Media Center Edition, Version 2002, Service Pack 2.

When I watch certain videos on my computer, I get a strange echo sound, but it only seems to happen with people's voices in the videos. The videos it happens with are in .OGM and .AVI format. It's not my media player, because I've tried using Media Player Classic and WinAmp, they both do the same thing.

Strangely, I have some .AVI videos I recorded myself that are working fine, and when I listen to music or test Windows sounds, it's also fine.

Help?

 

Umm... I'm gonna bump this thread. This problem sort of effects my ability to watch anything interesting on my computer.

Halp please?

 

Never mind, got help from someone else....

If anyone's wondering, it was a codec issue. I downloaded some stuff from http://free-codecs.com .

 

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