Normalyy there should be the possibility to choose two options of video rendering and playback when starting a new project.
As I use a NVDIA GTX470 which is on the gpu accerleration list of graphic cards on adobe homepage I guess I should have the possibility to choose.
But when I start a new project there is no possibility to choose there is "software only" in that field.
Any ideas? Any hints?
What is your nVidia driver version?
update you're card driver.