Penumbra: Black Plague, NEED HELP!

[jssi03]

The game has been running flawlessly up until I enter the Research lab where you are to meet Amabel. Then it becomes really laggy to the point of where I get about 1 frame per minute! that is right 1 frame per MINUTE! Not second. It is at this point the game is frozen. Plus I am stuck here cause when I go to continue the game I am in that area! So there is no more Black Plague for me I guess. The game is up to date to version 1.01. As I said it ran flawlessly up to this point.... one thing I have noticed that once in a while when I appear in the room I am under the floor or stuck in between it then about 10 seconds later I am placed at the correct hight for the floor but I cannot move no matter how long I wait. It is hard to deal with cause it takes soo long just to turn. One time I got out and back into the hall way outside the Research lab and then the game starts running fine so its this room that is having the trouble. Also when I am stuck in that room I noticed in my Task Manager that it starts to use more and more memory and slowing down my PC.

Is there anything I can do about this? It is patched to 1.01... It would be nice to be able to finish this game.