I had the computer from a distant friend who cleaned up before giving it to me. The PC is an old Dell computer and has one C drive. I don't have any external hard drive either. I checked in Add/Remove programs to see if anything strange showing which wasn't. All I know is; since I installed AVG 8 software in, the "watchdog" pop up started to appear!!!
Unfortunately I am not a computer expert :-( but I will be grateful if you or anyone else could guide me some guidance for how to suss this issue out!!.