I'm running Win XP Home with automatic updating.
I've always had my desktop background set to <none> (i.e., BSOD Blue), and my wife has installed a panda-cam screen-saver.
The desktop background and screen saver have suddenly started changing every few minutes. I've gone into Control Panel | Display and reset the desktop to <none> and pressed "Apply," and done the same for the screen saver, but the settings don't "stick" on the next boot.
I have cable modem broadband and run Norton Antivirus with an auto-update subscription and a weekly total scan, plus the current free version of ZoneAlarm.
How do I get off this annoying merry-go-round?