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A nice, easy way to change your Windows 7 Login Screen Background. If you don't know what the Login Screen is, press (and hold) the Windows Key and then press L.
By default, Windows 7 has a sort of Blue, swirly screen. Some computers may have other colors, like Green and Black. But it's still easy to change it to whatever picture you want.
1) Run Command Prompt as Administrator. (Start, All Programs, Accessories, Right-Click Command Prompt, Run as Administrator)
2) Type (or probably copy and paste) this text into Command Prompt and hit enter:
REG ADD HKLM\Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background /v OEMBackground /t REG_DWORD /d 1
(If the registry value has already been added, then it'll ask you if you want to overwrite the value. Just say "Yes".)
3) Now Navigate to C:\Windows\System32\oobe (or whatever your drive letter is; most are "C"). If it doesn't already exist, make a folder called "info". Inside this new folder, create another called "backgrounds" (once again, if it doesn't already exist)
4) Copy the image (this needs to be in .JPG) you want as your Login Background into this "backgrounds" folder. Rename it to "backgrounddefault".
Now restart your computer, and you should see your new Login screen.
If any part of this tutorial was unclear in any way, just say so and I'll do my best to fix it.
Enjoy!