1. Type regedit in RUN or Startmenu search box and press Enter. It'll open Registry Editor.
2. Now go to following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background
3. Now in right-side pane, change value of OEMBackground to 1 . If OEMBackground is not there then create new 32/64 bit new DWaord According To Your Machine And Give Its Name OEMBackground And Then Set Its Value To 1.
4. Now go to following folder: