I'm using Windows 10 on a PC. My computer is giving me a message as it shuts down. There's an app running in the background (and the computer has to close it) but the screen appears and disappears so quickly that I don't know what the app is. Should I be worried? I didn't have this problem three weeks ago. I did a full scan and Norton says I'm free from infections. Also, yesterday, when I had my computer on, and no programs are open, I did a ctrl+alt+delete to view the list in the task menu: it says that there are no apps running. Any help would be appreciated.