When I'm in Chrome, When I start up my imac, I get a bunch of these little pop-up ad windows in the top right corner. Each has an X but when I click it to close, another pops up and I have to keep going, sometimes through dozens of the little b*#tards. How to I switch them off, disable them, whatever? I can't seem to attach a pic, but the ads/windows 4" wide 1" tall, large blue A Applications icon to the left, ad title eg 'MacKeeper is ready to install', an X and a cog, which when clicked pulls up a save/block list, but i don't want to have to block each window once it's appeared, i want to disable that function. Thanks.