My Video output is great, but I am getting a slight ticking noise in some and in others the the sound will cut out for second. I also have done afew that sound great!

I am encoding in 6channel Dolby Surround sound, NTSC 29.97 with the output to DivX 5.02. The system I am using has an ECS K7S5A mobo and 1Ghz T-Bird. I am using the suck Onboard sound. Could this be my problem?

I have a Turtle Beach Santa Cruz in my main PC but I dont like to tie it up for such long periods of time, thats why I threw this one together.

Any input is appriciated