My Mathcad 14.0 was running fine with Windows 7 for about one year. All of a sudden it stopped. Now it only shows a circling cursor for 2 - 3 sec and then the cursor disappeares and that is all. Mathcad appears for a brief moment in Task manager processes (but not in applications)and disappears. All ather programs are running fine.\r\n When trying to open Mathacad through a saved file Windows shows an error message "There was a problem sending the command to the program." I did a full Mathcad reinstall but the problem persists.