I solved the problem by advice on:
in the sub title: Initializing preferences
It is hard to find the Preferences file. You have to do as Steinberg advises:
“Open the ‘Run’ command prompt by pressing the Windows logo key and R on the keyboard simultaneously. The Windows key is located between the keys Ctrl and alt.”
Then you see User (Leszek in my PC)> AppData> Roaming> Steinberg
I put the contents of the Steinberg file. There I found the Nuendo 7 64bit file, and the UserPreferences file in it.
The UserPreferences file I copied to the desktop (but it probably is not needed) - but the original found in the Nuendo 7 64bit file I deleted.
Wyszedłem z tego I left this - and opened Nuendo 7.
EUREKA! ELEGANT OPENING ALL EDITORS. Also Drum and Key Editor.
Thanks to the great Steinberg Support I read, I applied, I won!