From Time to time (especially after firmware updates) you may find yourself with an USB Error out of nowhere when trying to connect your Galaxy S3 with your computer.

You will get a "Device not recognized" bubble in the Taskbar and cannot access your Galaxy S3.

The solution is rather simple and relies mainly on the problem, that after a firmware update the current installed driver is not suitable for the new firmware. For whatever reason, Win7 does not recognize a different hardware and therefore will not install any new driver automatically.

If you try to re-install the Driver over Kies that will not work (no idea why) - you now can search and download the latest samsung drivers for yourself, but if you are lazy like me, just do the folowing and everything will be fine:

Disconnect your Galaxy S3 from USB
Shut Down your S3
Start it again (some ppl say you have to wait 3 minutes until you restart, but that's bullshit, just restart)
Connect to your PC over USB

Ta-Da, you're fine. Win7 new recognizes the new device paramters and reinstalls the proper drivers, your S3 will be connected without any problem.

That may be a god hint for all of us who never restart their phone (like me).

Hope this post helped you ;-)