Change the Windows 7 Logon screen Background

A Registry tweak
The process begins with a very minor Registry tweak. Even for those who would not normally feel comfortable editing the Registry, this one’s a piece of cake. To begin, click the Start button and type Regedit in the Search box. Then, select the appropriate result and press [Enter]. When you do, you’ll see the User Account Control, shown in Figure A, and will need to click the Yes button. Note: Editing the Windows Registry file is not without its risks, so be sure you have a verified backup before making any changes.

You will encounter a UAC when you launch the Registry Editor.
Once the Registry Editor launches, locate and right-click on HKEY_LOCAL_MACHINE key and select the Find command. When you see the Find dialog box, type OEMBackground in the text box and make sure that only the Values check box is selected, as shown in Figure B.

Type OEMBackground in the Find dialog box.
When the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background key opens, locate and double-click the OEMBackground value. When you see the Edit DWORD dialog box, change the value data from 0 to 1, as shown in Figure C. (If the OEMBackground value doesn’t exist in the Background key, you’ll need to pull down the Edit menu from that key and select New | DWORD (32-bit) Value).

Change the value data from 0 to 1.

To complete this part of the operation, click OK to close the Edit DWORD dialog box and then close the Registry Editor.
Creating folders
In the second part of the operation, you’ll need to create a couple of folders. To begin, launch Windows Explorer. Then navigate to the C:\Windows\System32\Oobe folder. Once you access the Oobe folder, click the New Folder button in the Windows Explorer toolbar. You’ll see a confirmation dialog box, like the one shown in Figure D. When you click Continue, the new folder will be created and you can name it info.

When you click the New Folder button, you’ll encounter a confirmation dialog box.

Then, open the info folder, click the New Folder button again, work through the confirmation dialog box, and then name the second new folder backgrounds.
Configuring the wallpaper

You can use any image that you want for your new Logon screen wallpaper. However, the image has to be in JPG format and you need to name it backgroundDefault.jpg. When you copy your file to the Windows\System32\Oobe\info\backgrounds folder, you’ll encounter and will need to work through a confirmation dialog box similar to the one shown in Figure D.

Two other things to keep in mind: First, the actual file size of backgroundDefault.jpg cannot exceed 256 KB. Second, you’ll want to use an image whose dimensions match the screen resolution that you are using. If you use a file whose dimensions are smaller, the image will be stretched and may appear distorted.

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