I have a photo slide show that suddenly appears when the computer is on but not actively being used. A question appears when I try to close it that asks Do you want the script to continue running?. When I click no the screen freezes and the only thing to clear it is to cut off the computer at the main on/off switch and start up again.
Slideshow is probably on as a screen saver. Go to
control panel > display and turn screen saver off