How to change log on background

Windows 7

1. Create (or edit) a JPEG file that is sized to your primary monitor's resolution, is less than 200 000 bytes and call it backgroundDefault.jpg
2. Using Windows Explorer, go to (and create the last few, if necessary) C:\Windows\System32\oobe\Info\Backgrounds
3. Copy the file from the first step into the folder from the second
4. Start > Regedit
   1. Start at HKEY_LOCAL_MACHINE
   2. Navigate to Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background\
   3. Create or edit the DWORD value OEMBackground and set it to 1
5. Lock the computer to see the new masterpiece!