I use Google Earth a lot to look at my tracks and waypoints. I am sure I used it within the past week. When I tried to do it today I got a message saying Google Earth wasn't installed. I got similar messages from both Mapsource and Basecamp. For the past few years I have had to run Google Earth before trying to view tracks in it. So I did do that. I uninstalled and reinstalled Google Earth. I rebooted the computer. I am running a PC with Windows 8.1. Any ideas of what could be wrong.