iMac Internet sites redirecting
About a week ago audio advertisements have started playing in the background on my iMac. Also, when I click on a web site, I am frequently redirected to an unrelated and unwanted site! I started getting messages that my flashplayer needs updated, which I tried to do. When I click to update the flashplayer, a messsage of gibberish appears about the windows product I tried to install. My iMac is about a year old and uses OS X Version 10.7.5.
iMac, Mac OS X (10.7.5), IMac a year old