Ao, open FRAPS and turn off the record sound feature and try recording. If it records fine then, you need to update the sound drivers for your sound card or the motherboard drivers for the onboard sound device. If that doesn't help let me know.
Also everyone wants to make sure they are using the latest catalyst drives if using ATI cards.
Remember too, if you are only using the free demo of FRAPS you only get 30 seconds of watermarked footage at a time. You can set you shots according to that time frame and still do some nice videos if you try
