meh, i guess
I have 2 ATI HD 5750 cards in my pc (in Crosfire) and I had no issues playing DS2. So it is not something specific to that card.
This. It was a bug with FLT's crack. A crackfix is up but I suggest you buy this game instead as it's just amazing.
You need to continually mash the Action button. Simply pressing it once is not enough. This is the same any time it tells you to press the Action button in this game.