When I click on an email, I get a page IE cannot display the page and if I click on diagnose connection problems, reply is no problems with network connection. Clicking back button kicks me off internet. If I ignore message and just use back button, I repeat opening an email, reading part (if I'm lucky) and the sequence repeats. Interjected in the middle of this is a pop up on ad.yieldmanager.com!! Tried using Yahoo antivirus program and ran Norton scan (again).