Cuda does not work with Xilisoft Video Converter Ultimate by updating 344.11

Accelerated Computing CUDA CUDA Programming and Performance
1

I use Xilisoft Video Converter Ultimate latest version, and is unresponsive controller cuda Blast video my GTX 580, I find no explanation when I back my PC to the previous version which is the 337.88, it works perfectly.
ya please if you can give me a quick solution because I use the window 8.1 operating system. Required to update the driver and have to restore.
My PC features are:

RAM: 16GB
VIDEO: GTX580
PROCESSOR: Core i7 4770K
OS: Window Pro 8.1 x64

2

Stay with the older driver. The newer driver may not include the library for nvcuvenc, which is now deprecated. There should be no problem using 337.88 with that GPU on windows 8.1