Cole2k - I've been using this for some time. It gives you the options to pick and choose everything upon install.
CCCP - Combined Community Codec Pack is a very complete pack that you can use to watch all kinds of media.
Packs to avoid:
K-Lite - has a bunch of extra unneeded things. Also, I wouldn't trust anything that has any affiliation with Kazaa. (Eeek Virus!)
If you are on a linux system and don't have Windows Media Player, then you can download VLC Media Player. It is included in more popular linux distros like Ubuntu. This player has all the codecs and other playback devices you'll need for anime built in.
- Download cole2k advanced from cole2k.net
- Run the install
- Choose Expert
- Agree to the EULA
- Uncheck the boxes for search-bars and other crap
- Under source splitters and filters, under Haalia Media Splitter, check AVI Support
- Under Extra's, uncheck shell context menu (and GSpot Codec info tool if you want.)