Preview pane and Startup

For some reason my mail preview pane has ceased to show content of emails. Also the only way I can open the app is by going to start, (Bottom left and selecting the app then opening it as the 'Administrator. I have installed and uninstalled all three versions. In between I have cleaned out all reference to eMClient from my PC even to the extent of putting the apps on a stick. I have searched and tried all the methods suggested. I am at a loss, can anyone assist. The apps all work n my phone and tablet so I have a feeling it is as usual Microsoft perhaps?