I recently had a computer made for me and my family. It was running perfectly for the first few weeks, but then it began to slow down. I know have numerous pop ups and the computer is slowing down. My guess is that my children must have downloaded files with viruses. I downloaded hijackthis and was proceeding to scan and save a log, but during the scan it says that there is a program error and closes. it does this on every attempt. Can someone please help me?