Thunderbird is already running, but not responding

I am trying to install Mozilla Thunderbird email. I installed it and tried to connect it to my existing Thunderbird data and could not get it to connect si I did an uninstall and removed it then reinstalled the software now I get the following: "Thunderbird is already running, but not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system." I have tried a restart that does not work, I have removed the software restarted the system and it does not show, then reinstalled the software and I get the same message. I went into regedit and removed everything I could find that said Thunderbird still no good. When I display what is running using the alt, control, delete to bring us a display it shows nothing running. When I look at process I do not see anything related to Thunderbird. I just had to reinstall the system due to other problems and I am in the process of reloading everything.

Thanks for any help, JohnStart Free Trial