I first had Electrum 1.5.6 which was running. One fine day, it stopped working. So, I installed 1.7.2 but it also did not work. I do not get any error, it just doesn't start. When I start it, I can see it appearing the "Processes" in Task Manager for a second or two and then disappears. No errors or any message.I tried the portable client also (Electrum-1.7.2.exe) but it also does not start.