I have 2 installs of version 15 that install fine but will not launch. They act like they are starting (task bar icon highlights) and then it it just disappears off the task bar. There is no error message. I have installed them from the update and it installed fine. When it did not launch, I uninstalled and then reinstalled using the separate download. Install looked fine but it will still not launch. I have installed with both methods on other workstations and they work fine. Any suggestions?