Well,, This whole process could not necessarily be completely automated through batch scripting, without doing some major scripting... is this on a 7 system?
If so, Powershell would be the better solution. I might be able to work something up.
This would take some time, and someone may come up with something before me.
If you can create the screen shot yourself, then a simple regkey file would work.
This would be a harmless prank, so, I'll see what I can come up with, when I get time.