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Can you give us any more information to help you out here...
For starters, is this with 5.1 speakers attached or in 5.1 mode but with only 2.1 attached or something like that.
Are there certain programs, songs etc... that it happens on or during?
Have you had the card/speakers a while now or is this a card you just bought?
If you've had it a while and it just started exhibiting this behavoir, do you remember anything you did or events that happened (like a power out) shortly before it started doing it?
Yikes...time to disable hardware, one at the time and find the culprit.

yeah I thought that was bad..
I think... and I say I think because every time I thought I fixed it, it came back, but this time I think I solved it..
The fucking tv capture card I have installed on my mobo didn't have the drivers installed properly.. I had previously heard that tv capture cards can mess with soundcards audio signal, and after going through the device manager I found a few driver issues including the 'Multimedia Controller' having a yellow ! next to it.. turns out the driver was for my tv card..
pluddy driver issue..
this how it looks now
http://img5.imageshack.us/i/33257948.jpg/
*snip*
AND NO CRACKLING/POPPING NOISE!! WOOOOO!!!!