Audio and Video Codec list removal and tweaking
Start --> Settings --> Control Panel --> Sounds and Audio Devices will bring you to this first image:
Here you can see both Audio and Video codecs along with some other things. In this case I'm selecting video codecs and hitting properties then selecting the properties tab:
There's all of the codecs that I have installed. I can remove any that I don't want anymore by selecting the codec and hitting remove. By hitting properties I can usually get to additional codec settings if they're supported.