Did you know? Windows 7 allows you to easily change the background of login screen, so you can use any of your favorite wallpaper as login screen background without using any 3rd party software.
How to do that? Just follow these simple steps:
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

PS: You can use following ready-made registry script to enable custom login backgrounds, no need to manually apply the hack using 1-3 steps:
4. Now go to following folder:
%windir%\System32\oobe
Here %windir% represents "Windows" folder present in the system drive where Windows 7 is installed.
5. Create a new folder "info" inside oobe folder. Then again create a new folder "backgrounds" inside info folder. So the final path would be:
%windir%\System32\oobe\info\backgrounds
6. Now copy any desired wallpaper to this new "backgrounds" folder but following conditions must be followed:
- The image name must be backgroundDefault.jpg.
- The image size must be less than 256 KB.
- The image format must be JPG.

7. That's it. Once you copy the wallpaper to "backgrounds" folder, your Windows 7 login screen will start using this new wallpaper as background. You can check the new login screen background by logging off or locking Windows.

PS: You can also use custom sized images based upon your screen resolution with the following names:
- backgroundDefault.jpg
- background768x1280.jpg (0.6)
- background900x1440.jpg (0.625)
- background960x1280.jpg (0.75)
- background1024x1280.jpg (0.8)
- background1280x1024.jpg (1.25)
- background1024x768.jpg (1.33-)
- background1280x960.jpg (1.33-)
- background1600x1200.jpg (1.33-)
- background1440x900.jpg (1.6)
- background1920x1200.jpg (1.6)
- background1280x768.jpg (1.66-)
- background1360x768.jpg (1.770833-)
NOTE: The backgroundDefault.jpg image is loaded and stretched-to-fit when a resolution/ratio-specific background cannot be found. If the background cannot be loaded (e.g. image physically too large, incorrect ratio, etc.), the default image is loaded from imagesres.dll file.
Also check How to Customize Windows 7 Login Screen Text and Button Set.
If you want to use a free tool to customize Windows 7 login screen, check following list:
Ultimate Collection of the Best Free Tools to Customize Windows 7 Login Screen
This article was posted by VG in following section: Windows 7.
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EP
Hey Vishal,
Is it okay if I make a video of this tutorial and upload it to YouTube? I need your permission to use your link for the registry script.
Thanks in advance,
EP
P.S. If you say yes, do you want me to create videos of more of your tutorials? I will credit you, of course.
VG
^^ Sure mate. I'm sure our readers will definitely like the videos. You can go ahead and create the videos. :)
Stupid Microsoft
If the idiots at microsoft let you modify "background.bmp" without the Trusted Installer bullshit, this hack wouldn't be necessary.
Tharaka
Sorry for the earlier post. It worked. Stupid me had done a spelling mistake in the reg key.
For those who are missing the reg key, create a new DWORD named OEMBackground (not OEMBackgoud) and put the value as 1.
IHOP-KC Housing
I tried following your guide on a full release of windows 7 ultimate but what not able to find the deeper files that you went into.
I did find the HKEY_LOCAL_MACHINE but there is only the (Default) REG_SZ file in there. I tried finding the sub folders that you went into but I was un-able to find them as well. :/
spy99
WOW BEST.....now my friends can call me a 10 thousand percent otaku with a new anime log in page.....
thanks for awesome stuff
HK
Sweet! Thanks!
FR13R
OMG thankyou
this is so cash
balaji
Hi VG,
I have changed the picture resolution as per the guidelines but am not getting the picture any suggesstions pls...
backgroundDefault.jpg
background768×1280.jpg (0.6)
background900×1440.jpg (0.625)
background960×1280.jpg (0.75)
background1024×1280.jpg (0.8)
background1280×1024.jpg (1.25)
background1024×768.jpg (1.33-)
background1280×960.jpg (1.33-)
background1600×1200.jpg (1.33-)
background1440×900.jpg (1.6)
background1920×1200.jpg (1.6)
background1280×768.jpg (1.66-)
background1360×768.jpg (1.770833-)
I have used file name as backgroundDefault1280x960.jpg
VG
^^ You can check various free tools to automatically change login screen:
http://www.askvg.com/logon-editor-advanced-login-screen-editor-for-windows-7/