At the bottom right corner of my computer screen I have a small red shield with an "X" in it. A pop up window comes up with the message "You have a security problem". I have tried following the link. It will scan my computer and tell me that there is a problem but when I click on "remove" it does nothing. I have run Norton and it doesn't find it. I tried to download AVG. It seemed to download but now I can't find it. Any suggestions?