I had the same type of bug get in mine,tried everything i could think of got rid of most of it ,but seemed liked the "host"was hidden cause when i'd reboot and click on anything it would repopulate and i'd be back at ground zero this virus got through norton totally undetected . What worked for me was a 20$ subscription to Stopzilla its an anti ad & malware program found something like 700 infected files .What it didnt get rid of avast took care of the rest.- my hair is starting to grow back now .