I want to add to Danation an answer with the following.
If you installed KIES and you tried the following instructions several times (for the SDK for Android), this worked for me:
As a precaution, disconnect the device and click "Cancel USB debugging authorization." Now go to kies and reinstall the device driver as shown in the image below. Connect the device.
For me it was a normal procedure, it usually works when installing kies, but I got a little stuck in it today and I hope that I can help others with my solution.

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