Buffer Under Run on DJ 2.0

Ok i know what a buffer-underrun is, and I do not know why it keeps coming up. I have know progams open whatsoever. The only thing running is DJ. When i load the CDI its says that there is only 2 sessions and 2 tracks in the CDI. The only game i have burnt succesfully is Quake III arena , and that CDI had 2 sessions, and like 17 tracks. Every other game i dowload only has 2 and when i try to burn them, they all get to 4% and i get a buffer underrun WTF is going on...?