I'm using Studio 11 and have a problem with audio clipping whenever I use fades. It's a consistent problem that I've had with every video I've rendered no matter the format or quality. Any idea how to fix it?

You can see the problem in this video here http://jp.youtube.com/watch?v=Mdeoktnv8ko

 I don't think it's a hardware problem but just incase here are the specs of the PC I'm using.

Windows Vista Home Premium

AMD Athlon 64-bit Dual core

2GB RAM

ATI-Radeon HD3200 video card.

 Hope I can find a solution as it's an extremely irritating problem.