each codec pack/program usually has and uninstall.exe it's just that they are called diferent names depending on the program.
If you don't have any projects underway I'd suggest reinstalling WMM2 as well.
Try making a few huffyuv clips like Jaddzia showed you above and test it out with that.
To cut down on the amount of space the huffyuv takes up you can always disable the audio stream in virtual dub (which you may need to reinstall along with other codecs.)
Quick question tho... you aren't running vista are you.....?
new banzors in the making :p