Now you can change Welcome/logon screen’s background in Windows 7 and its supported officially. Microsoft has been made a change to customize or ability to load JPG images as background of the welcome/logon screen without using any third party software.
Although the functionality was designed for ease of OEMs to set their own backgrounds to Welcome/logon screen. It can be done by changing few registry settings and you can set your own background.
- Run Registry Editor and navigate to:HKLMSoftwareMicrosoftWindowsCurrentVersionAuthenticationLogonUIBackground
- Now create a DWORD value called OEMBackground and set it to 1
- Now copy your image file (JPG file) into %windir%system32oobeinfobackgrounds and rename it tobackgroundDefault.jpg (By default info & backgrounds folders don’t exist, so create them.)
NOTE: Image must be less than 256kb in size.