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Hi nau5feratu!
It could be several reasons; I try to give you several steps which might help to solve your problem. Please keep in mind that Battlefield3 is actually not supporting Windows 8. All provided workarounds are for Windows 7. The only tip I can give for Windows 8 is that a lot of graphic drivers can cause trouble in Windows 8. Try newest or beta state of your graphic driver.
At first, please check your latest video-card driver and check what version of the origin client is installed on your computer. Install the newest driver for your video card.
Right click in Origin under "my games" on the Battlefield3 icon and choose "Repair".
Login under http://battlelog.battlefield.com/bf3/gate/ and launch the game from the browser. If it start right from the battlelog, you should deinstall the Origin client, install the newest client as administrator You find the actual version of origin here: www.origin.com/download. Reinstall Battlefield and try to start it again.
You should check the following ports on your router:
TCP: 80, 443, 9988, 20000-20100, 22990, 17502, 42127
UDP: 3659, 14000-14016, 22990-23006, 25200-25300
For specific instructions on how to open your ports, please visit http://www.portforward.com/ or contact your router manufacturer
Cheers
Basti