Clicking or choppy sound

Hi All.

I just installed the bata version of Asterisknow 1.6. when i make a call i get a type of clicking or choppy sound durring the call. I install the system on an IBM Thinkcentre M52. i have a TDM400P card with 4 FXO ports.

When i call VM and record my message i get a type of clicking. I wish i could attach a wave file. i saved myself a VM message and have a recording of what it sounds like. Email me and i will send it to you if you would like to hear it for yourself. I tried the Internal Timers on and off and no good. I would love some ideas.