That's a boat load of codecs. It appears you've install a few codec packs for various video formats. When installing codecs, keep in mind it's best to keep them at a minimum since some of these don't play well together.
I've had problems with Ulead's codecs (intervideo) myself so it could be the cause. You should be able to turn those, the Sonic MPEG2 codecs, and the Roxio MPEG2 codecs off as well. With them turned off the programs that use them should use the default Microsoft codecs without any ill effects.
I would turn the others back on a few at a time to ensure there are no conflicts.
Glad to see that your on the right path to getting it worked out.
Codec problems can be a bit of a headache and while it looked like the DeskScapes program was the cause, it actually just made you aware that the problem existed.
Also, glad to see your enjoying the dream. There's a few more in my gallery for download as well, be sure to check them out.