This also is from Sony's website...
GPU-accelerated rendering with the MainConcept AVC format
GPU-accelerated rendering with the MainConcept AVC format can fail if your system has an NVIDIA CUDA driver but no NVIDIA CUDA-capable GPU is installed. This will result in an error dialog when as soon as you try to render with the MainConcept AVC format. To fix this, uninstall the NVIDIA CUDA driver, or Render using CPU Only in the Customize Render Dialogue.
this is the address
https://www.custcenter.com/app/answers/detail/a_id/5068/kw/5068
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ASUS P8P67 Deluxe MB
EVGA GeForce GTX 560 Ti 1 GB DDR 5
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Two Seagate Barracuda 500g SATA III drives
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Xigmatek Dark Knight CPU Cooler
Win 7 Pro
VEGAS 8.0
VEGAS 11.0 32 & 64 bit
Sony VX2100
Sony HVR-Z7U hi def
Alesis HD24