Change the logon screen picture in Windows 7

Here is how to change the logon screen picture in Windows 7.

1. First you have to enable the ability in the registry. You need to create a dword called "OEMBackground" and give it a value of 00000001.
   \HKLM\Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background
   
2. Now you need to go to C:\Windows\System32\oobe\info\backgrounds. More than likely the directory won't exist so you'll need to create it yourself. In this directory you just need to put in a background picture you want to use. It must be named backgroundDefault.jpg and cannot be any larger than 256KB. 

Reboot to see the results.

Enjoy