Changing the Windows 7/Server 2008 R2 Login Background

I have no idea where my entry for July 29 went, so I'm putting this entry here. I only vaguely remember what it was supposed to be about, so I'm posting this entry I was saving for when I was too lazy to write something.

I don't know how I missed this one, but I recently changed the Windows 7 and Windows Server 2008 R2 login background on two computers, a notebook (1366x768 resolution) and a desktop (1280x1024 resolution). Changing that background luckily doesn't require any third-party software replete with viruses and adware. Here's a step-by-step guide. This is what worked for me, but don't blame me if you bork your computer.

( The steps and stuff )