OS = Operating System.
Mac OSX or Windows or Linux.
I suspect you're using Windows. Is it XP, Vista, Windows 7 or 8?
If you're interested, I can tell you how to create a screensaver that will display pictures of your choice.

Cormanus, thanks. I'm not much of a computer guy, but. Take a stab at it. If I can't figure it out my son or son in law probably can.
Happy to. It's pretty straight forward. I'm out on a charity Poker Run today—that brought the rain on—but I'll do something for you later or tomorrow.
Cheers
No rush..see my pics in the weather thread. Im not going anywhere but out to plow snow