I know I had an annoying problem when I installed Portal II. Apparently the game would not work with the most recent update to my graphics driver. I had to roll it back to the default before I could play the game. Now I avoid ever updating my graphics driver just in case it prevents me from playing Portal II again.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV