New
#471
Just download it again and install it. You can also burn the game to a disc if you choose.
I beleive D2D allows 5 activations of the game, and the windows live portion is 15 activations.
For me, I found Installing the game in Vista SP1 compatability mode resolved many issues. I had to do this to even get the game listed in 7's game explorer.
Patch before first launch.