Hi, yesterday, my background wallpaper on my desktop unexpectedly changed from the picture of my dog to a blue screen that said "You should run an anti Virus check" or something like that. A few seconds later it changed to a red screen with the same text. Finally after a few seconds, it changed AGAIN, and ever since then my wallpaper has been some dark blue thing with light blue swirl designs, and pop-ups. I can't exit the pop-ups, I think they're part of the wall paper. Also, right clicking and going into properties doesn't help. I can't change the background...all the options are greyed out. Can anyone help? I've run a lot of anti viruses, and gotten rid of some other symptoms, but the pop-up background is still there, and the options to chnge it are greyed out. Thanks in advamce, Ian.