"Thunderbird is already running" error every time I try to start Thunderbird, even if it is not running

Posted by Robert on Super User See other posts from Super User or by Robert
Published on 2012-09-23T03:59:11Z Indexed on 2012/09/23 15:40 UTC
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Windows

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email

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thunderbird

I cannot open Thunderbird. The process isn't running, but when I click on the icon, I get the the following error:

Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system.

I've tried the following:

Ending the task in Task Manager
Deleting parent.lock
Uninstalling Thunderbird
Uninstalling Firefox
Running Thunderbird in software "safe mode" and Windows safe mode

What can I do to fix this problem?

The problem looks more serious than expected. I do not see any Mail folder in my profile at C:\Users\your-username\AppData\Mozilla\Thunderbird. I think I lost my email.

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