I had installed the game mass effect 2 fines and configured the settings for graphics and sound etc. when I am regarding to run the game it requests the Physx O. But I have an ATI card. Anyway I download Physx from Nvidia's site and work it at present to get this the option to press next to install Physx is grayed out no matter what I do I read the agreement from top to bottom I try to start the installation by choosing run as administrator (using win7 64bit) but I just cannot install it. I even tried the one that came with the game.
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