Vista Lock Screen
 

I'm trying change my Vista lock screen from the default greenish blue screen to something awesome like ______. I know there are tons of programs I can install to change my lock screen. But I'm trying to change it on my work computer and don't really want to install anything.

So is it rather easy to change the default lock screen by myself without installing anything?

Thanks.

PS: It might sound like an oxymoron trying to tinker around on my work computer, but ugh ya. ahaha