Continous stream of "harmful webpage or file" messages

If this information already posted, I apologize. When I clicked Post, I got “Avast.com is not responding” and when the page was recovered, there was no indication of my post. Anyway…

Avast has started bringing up an almost nonstop cycle of messages that Web Shield has blocked a harmful webpage or file. I ran a scan, told Avast to fix everything (although they were all low risk), and it made absolutely no difference. The series of messages resumed and continues.

My CPU usage is constantly at 100% and I can hardly do anything on my computer. HELP!

I’ve attached a copy of one of the messages that keep popping up.

You most likely have a infection…
Help with this is done in viruses and worms forum section. At top in that section you find instructions about needed logs to post for reciving help