Ventrillo and problems with my mic

[Tristrum]

OK this is my problem i have bought 3 new mics in the past couple weeks and this problem keeps persisting so i think it mite be my sound card. I have a Creative Labs Live soundcard 24 bit (7.1) When i use ventrillo to talk to my clan mates for BF2 all they hear is a loud screeching sound and then they yell at me has anyone else had this problem or any suggestions on how to fix it?

[Tyler]

I suggest testing out the mic in sound recorder, see if you can record and hear your own voice. Double check your connections and sound options. I know sometimes the mic comes muted by default, but that can't explain the screeching.

[smartkid]

sound recorder rocks (its really good for stealing songs off the radio )

That might be your mic feeding back off the speakers try it when your far away from them, if its not them then im not sure but iv got a few sound engineer mates who i'll ask.