While there are several freeware utilities that allow you to capture screenshots, there are hardly any which will let you capture screenshots of your Windows logon screens.
Windows 7 Login Camera is a free tool will let you capture Windows logon screen screenshots easily. by clicking the “Ease of Access” button.
Simply download and run the installer and click “Install”. To uninstall it, click “Remove”.
Do note that this program will replace the “Utilman.exe” that is located on the “%windir%\System32” folder.
While this program also backs up the “Utilman.exe” if you get an error message that the file has not been backed up, you may definitely want to back it up manually. You can always restore it manually, later.
Download Page: DeviantArt.
Works on Windows 32-bit only!
NOTE: This app sure appears to have been 'inspired' from Lee's Windows 7 Logon Screen Ease Of Access Button Replacement which amongst other things also allows you to take screenshots of the logon screen and which was the first tool of its kind.