Thursday both Thunderbird and Fire fox suddenly stopped working with a message that they were no responding. I closed the windows and tried to bring them back in. The response was Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window. I cancelled and looked at the task manager which indicated that thunderbird was not there. After another try I did a conputer restart and finally a shutdown , unplug and restart with the same result. I I refreshed thunderbird, no luck. I deleted and reinstalled Thunderbird, still no go. ( I was doing the same thing with Firefox. I had to go out of town for 2 days and Firefox has healed itself but thunderbird still doesn't work. HELP! I'll be looking for emails on my phone, I don't want to use a different email on my desktop.