Win10 system can not set the lock screen wallpaper method

Solution:
1, first open the folder C: ProgramDataMicrosoftWindows (you can press WIN + R, then enter %ProgramData%MicrosoftWindows Enter in the run); Br> 2, find the SystemData folder, then this folder can not be accessed, no permissions, the following methods to obtain full permissions:
right-click properties & mdash; & ldquo; security & rdquo; & mdash; & ldquo; advanced button & rdquo; & mdash; —“Change"Owner——“Advanced"——“Search Now”—— then select the administrator account you are logged into ——““&mquoash ;— all the way to determine. Specific steps: win10 system encountered "You currently do not have access to the folder" how to do? How to obtain permissions?

3, the folder can be opened at this time, delete all the content can be ;

4, then press WIN+R to open the run, enter regedit and press Enter to open the registry;
5, expand HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionSystemProtectedUserData<6>, select SystemProtectedUserData and delete all data on the right (except the default) , the item itself should not be deleted;

7, after restarting the Win10 system, the problem that the lock screen cannot be set is solved!