Amnesia works up until I can control my character

[Despo]

I have a Windows 7 64-bit OS with an Nvidia GeForce GT 540M video driver. I have a downloaded copy of Amnesia from Amazon.com, and the set up and installation have been completed successfully. I am able to see all (what I believe to be all) visuals upon launch of the game. Once I start a new game, the character recites his opening lines with a black screen. Once his lines are finished, the black screen remans and a small dot flashes briefly in the center of the screen (perhaps the crosshairs) and then the screen remains as it is. I can control the character, even interact with objects, but I do so with a black screen. Strangely, the pause menu, inventory screen, and the mementos/journals/diaries menu can be seen, but I cannot see the environment or my character. That is all the information I can post for this problem. Please help.

Thank you.