thanks to sentunesys!
i explain the steps in more detail:
1. copy all files from the bin folder in watch dogs (usually here:C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\games\Watch_Dogs\bin)
into the watch_dogs folder.
2. delete the files from the bin folder (not the folder itself)
3. start uplay
4. when uplay is running, start the watch_dogs.exe directly from the watch_dogs folder.
!!!important!!! if you hit "play" in uplay the game wont start!! see step 4!
again, thanks to sentunesys! you saved the day man!