[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\
Find this location, check its several subsections, several of which are a string of numbers and letters. You can check them one by one to see which one includes the key "Nero Scout", and then you can delete the whole subsection and you're done.
Or you can look for "Nero Scout" in the registry until you find the location above, and delete the sub-item.
It's best to reboot and the problem is solved.
The problem was solved by rebooting.