I have a problem with something called "Friendchecker". It selects a word in the text of my screen and it changes to blue text underlined twice. When you hover over it an ad appears. Don't know what happens if you click on ad as I haven't. I have tried many programs but haven't been able to get rid of it. It appears not matter what the screen is - in a game as well and not just once but multiple places. Can you help?