Recording my voice while running Fraps ? Help !

So i was hoping to do a " Let's Play " series on youtube. So basically a narrated game walkthrough and was wondering how do i get my voice to record while i play the game and while im picking up my voice picking up the game sounds ? Anyway to get both and just edit it after

The easiest way would be to simply dub your voice over the top of the fraps video afterwards. Using fraps to record game footage alone often results in slowdowns in games, using it to record an extra audio track on top of that as well would slow things down even further, unless you have one seriously powerful CPU and plenty of RAM to help with it all.