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  sudo chattr -R -i "$HOME/Dropbox" sudo chown -R "$USER" "$HOME/Dropbox" chmod -R u+rw ~/Dropbox dropbox stop; rm -rf ~/Dropbox ~/.dropbox ~/.dropbox-dist; dropbox start -i   Note that Dropbox folder path point to default position. If you have changed this path, make appropriate corrections above

Delete HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\background\shellex\ContextMenuHandlers\DropboxExt ​ HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers\DropboxExt ​ HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\DropboxExt HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers\DropboxExt Credit: https://www.reddit.com/r/dropbox/comments/drlt50/how_to_remove_send_with_transfer_from_context_menu/

Run registry and delete everything under HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace Right click HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace , Permission. Select Deny for Everyone.