Windows 7: How to use VGA for video converting

Hi guys.
Is it possible to help my dualcore CPU in video converting with my ATI HD4670 VGA? Ive heard somewhere that it is possible (or that Windows should use VGA with CPU automaticaly), but when I drag&drop divx movie into my ZEN, it only uses my CPU and it takes too long to convert 2 hour movie (700MB).
Thanks for reply

Hi Lord of Minor!

I think that you might not have GPU converter software from ATI (called Avivo Video Converter)installed:

ATI Radeon

If u wanna check, just right click desktop and click on Catalyst Control Center, then go to Video Converter from top-left menu. Over there, if you see "Start Video Converter" button then you have it installed else not.

You need to install Avivo package from above link for GPU video converting to work.

Hope this helps!