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Hi i have an imac and i want to play with a game but work only on windows, i installed all but when i try to open game tell me "can't create D3D device,error code". I try to click install guest addition but it doesn't open nothing. Help me please

That is not a VBOX problem.

Modern Windows versions come without activated Autostart on external drivers because of malware like conficker.

In the guest start the explorer, choose cd/dvd and start the install.

Please read Chapter 4 of the User Manual.