I have done a great deal of disc creation using AVS with very variable results. DVDs tend to work best, but making audio CDs is a bit of a lottery. In my time I've tried every solution suggested, and I still cross my fingers every time I burn a disc.
I buy spindles of CDs up to 100. My suspicion is that the quality of these CDs is not uniform, so I've come to expect about 30% going in the garbage, because of course when the burn fails the CD is ruined - you only get one shot at each blank CD. Given that buying in bulk is cheap, it doesn't amount to a large financial problem. My annoyance stems from the time wasted - I've had a CD burn get to 96% complete and still fail. Sometimes I've just kept trying with the same files until it worked.
After much communication with AVS Help, I've still no idea what the root of the problem is. I do know that uninstalling/reinstalling makes no difference whatsoever.The logs they ask for kept mentioning Windows XP, even though I'm running Vista Businiess 64 bit. So, what I'm saying is that you'll probably be best to expect a certain failure rate, get used to it - be philosophical and calm, or give up. Your blood pressure will suffer otherwise.
Good luck!
James