I've looked at the guide to Codecs. Didn't really help. At this time I can't figure out how to get any of my avi or mpeg files to play right. The audio works fine. The picture shows up and I can see what is happening on screen but the colors are way off. Kind of have a rainbow effect like someone poured oil over the picture. Both AVICodec and GSpot tell me that I have the codecs that I need to play the movies installed. And it doesn't matter what player I use the same thing always happens. Anyone have any idea what might be going on? Thanks.

FFDShow and secondary filters often cause this problem but also, can solve it in some cases. So if you already have FFDShow installed, remove it. If not, try to install it.

What player do you use btw? If you right-click the picture when watching a video in a DirectShow-based player you can see what filters/codecs are used while playing.

Also verify your installed video codecs with GSpot (View->Installed Codecs) and see if you have any broken one(s) (highlighted in GSpot) on your system.

Hmm. Well, I figured out how to get all of the movies but two (the mpegs) on my HD to work. Uninstalled everything and then installed Xvid. Had to press some buttons in the Configure Decoder. Not really sure what any of them did, but hey, now it's working.
Anyhow, like I said, GSpot really wasn't much help it getting it figured out. From what I could figure out from the information it gave me, it said that my movies should play fine even before I messed with the configuration. Ah, well.
Thanks for the help.