win8.1 Copy File Error "Destination folder access Denied" What to do

resolving win8.1 system Copy File Error "Target folder Access Denied" method

　The method is as follows:

1, press "win+x" shortcut key, in the pop-up menu select "Command Prompt (Administrator)", enter "Icacls C:/setintegritylevel M" command return, wait a few minutes, the completion of the C-disk security level can be reduced to M-level. (If you want to recover, use icacls C:/setintegritylevel h to increase the C-disk security level to Level H.) )

2, right click on C Disk "Properties", pop-up "Local Disk C" dialog box, click "Security" option, Group or user name select "Authenticated Users" → "edit", in Authenticated Users permissions, will be fully controlled (or modified) corresponding to allow the check , and then click OK.