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Just started the game to find it unplayable.

My specs...

ATi Powercolor HD 5770
AMD Athlon II X4 620 @ 2.60 GHz
4 GB RAM
Attachments:
From the stickied thread at the top:

Disable Anti-Aliasing, Anisotropic Filtering and adaptive Anti-Aliasing in Catalyst Control Center

If that doesn't work try updating drivers