U need to have permision to do that..
ive added the Take Ownership.reg file Merge it,
to add easy Take Ownership to ur context menu..
browse to your Windowssystem32
look for authui.dll right click then Take Ownership.. Thats it!
now you can rename the original file to whatever name u want for restoration purposes..
copy the edited authui.dll to your WindowsSystem32
Note: I wont take responsible for any damage it may cause to your system..
Do it at your own risk.