Mic has repeating effect with lots of interference

I have been having problems with my headset mic. I cant seem to get it to work correctly. The sound works just find in the headphones, but people say the mic is super loud with a lot of interference and they can hear my game sounds coming through my mic. When I do the sound test through counterstrike, I hear my test repeating over and over as it gets quieter. I also heear all the interference. Sounds like the sound is stuck in some sort of loop.

I tried messing with the sound settings in XP as well as my Realtek HD Audio driver. Nothing seems to be working

As of now, I have it plugged in the front/side inputs of the case. I'm pretty sure its hooked to the mobo correctly as the sound works and I am pretty sure its just one solid plug into the mobo, not a bunch of little pins that I could have messed up.

So, anyone have an ideas?

Oh yeah and while im doing this, how do i put my signature in the bottom. I could never get that with this new setup.

Thanks

I have this headset:

http://www.newegg.com/Product/Prod [...] 6836504001

This case:

http://www.newegg.com/Product/Prod [...] 6811146025

A 680i LT mobo and Windows XP