I've got a problem with the creative vibra 128 card i've just put in this computer to replace the onboard sound. Whenever any sound is played, skipping and garbage sounds (similar to those on damaged mp3s or cds) is heard. I've tried the following:

-new drivers
-messing around with directx sound hardware acceleration
-messing around with settings in specific software, eg. winamp (both directsound out and waveout did the same, waveout was actually a little worse)

The sound only happens when the computer is actually doing something, for example i'll play a song in winamp and it'll start to do it, but a minute later when the computer is almost idle (and the song is still playing) it'll be fine.

Any ideas would be greatly appreciated. And also greatly appreciated would be a lack of advice saying to replace the card etc, i can't afford it.