This involves one simple registry tweak and making or finding a picture.

  1. Open Regedit. You can do this by holding the Windows Key and hitting R, which opens Run. Now type in “regedit” then hit enter.

  2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\<br />Authentication\LogonUI\Background

  3. Double-click on “OEMBackground” and change the value from 0 to 1.

  4. Create a JPEG smaller than 250Kb and save it as “backgroundDefault” in the C:\Windows\System32\oobe\info\backgrounds folder. Create the folder if it doesn’t exist yet.

Now, log off or lock your computer to see the changes. Windows Key + L.