I recommend adding Media Player Classic to audio as well.
Also, for audio-editing, Audacity is a very powerful, easy application to use. Perfect for beginners and experts alike. (http://audacity.sourceforge.net/)
I also recommend adding Conversion and Virtual Drive categories. Zamzar is a brilliant conversion utility that doesn't even require any download or software, and Virtual CloneDrive is also a good virtual drive. Google them if you want.