the itunes library .itl file is locked, on a locked disk or you do not have write permission for this file
Unable to open iTunes on my windows desktop
Windows, Windows 10
Unable to open iTunes on my windows desktop
Windows, Windows 10
See Empty/corrupt iTunes library after upgrade/crash - Apple Community, in particular the section of bullet points.
tt2
Locate the .itl file on your computer and right click it. Select Properties. Uncheck the "read only" box. Voila!
the itunes library .itl file is locked, on a locked disk or you do not have write permission for this file