When making a right click on the Explorer and select "Run as administrator" it doesn't start the Windows Explorer with admin rights. The Windows Vista/7 Explorer includes a special function to block such requests. To disable it, start regedit.exe and go to the following key: HKEY_CLASSES_ROOT\AppID\{CDCBCFCA-3CDC-436f-A4E2-0E02075250C2} make a right click on Permissions and set your user as owner of the key and give your current user writing permissions. Next, delete or rename the value RunAs. Now the Elevated-Unelevated Explorer Factory is disabled and you can start the Explorer with admin rights. This helps you delete files, for which you need admin rights. Have fun