so i got Ulead Video studio 11, and i put all the video clips that i took on holiday and they were were taken off diffrent cameras so i got about 3 diffrent file types, but everytime I convert them into a dvd pal (it either goes to MPEG 1 or 2, tried AVI aswell) some of the sections of the video have a clicking/squelching noise every second untill that clip has gone, and it will be in random clips. i have tried 9 times and waisted 10 hours trying to eradicate this clicking noise, but it just doesn't seem to go away! it's mostly present on the .MOV files. any idea's on what i can do? anyone else had this problem??

I have used it many times and never had this problem, every non essential program has been disabled.

running vista 32bit ultimate