A friend of mine in another country has downloaded avast and knows he has tons of viruses in his computer, as he didn't have any virus protection. I instructed him to download Avast and Malwarebytes.
Avast downloaded, and while he was doing a quick scan to start with before installing Malwarebytes, the scan speed went from 0.2 - 1.9 mb/sec constantly. He has no other programs running beyond the site we are communicating with, and no other previous virus protection programs, as I asked, explaining about conflicts. No games are running, no other programs beyond Avast.
Why is it running THAT slow, on an 80G hardrive with twin processors? He had even left it running over night, and it was only at 10%. Why is it running that slow, and how does he fix it?