Cali try this:
Go to http://www.Free-codecs.com
Download the K-Lite Codec pack
Install the Pack
Click on Start
>> All Programs
>> K-Lite Codec Pack
Then click on Configuration -Codec Tweak Tool
Once it opens up click on the button that says Fix Non-Working System Sound.
on the video comments part.. I think i liked it, but not the music.
As for tips go, if ur going 2 press the record button for fraps, and then press S, make sure you either press them at the same time, or cut off the bit that is paused in your video editor.
Also use the in-game zoom function, it wont pixelate..as much :P