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Happened to one of my computers too, it's running Windows XP SP3 and a GeForce 550Ti.
The launcher wouldn't even open the game, and both of our cards aren't on the unsupported list.
Big fail by whoever did that. Why not just allow the game to launch and let us deal with slow performance?
Luckily you can still force-launch the game itself.
After running the launcher to make sure your game is up to date:
Go to Start->Run
Enter "C:\Program Files\Diablo III\Diablo III.exe" -launch
if you're on a 64 bit system, enter instead:
"C:\Program Files (x86)\Diablo III\Diablo III.exe" -launch
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