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GUYS, please help... I have a problem with the game: I bought the official version with DLC, installed it, it automatically patched, and when I launch it, it shows "Ubisoft game launcher: error code 2" and doesn't start. How can I fix this?

I tried setting the shortcut properties to offline mode, and it works... but I'd like to try playing online. HELP!

Could the problem be that I'm using Vista?