How do i fix "Thunderbird is already running"

after a power outage i get the above message. i've tried re-installing, deleting the "parent.lock" file, and everything else on Mozilla forums but after a week of resetting using "Task Manager" it still happens. i don't understand why i cant find a resolution from Mozilla.i think i understand why it happens but i cant find any way to stop it happening. i can't use Safe Mode as it just tells me Thunderbird is already running. according to all the support forums that i have read this has been a problem with Thunderbird since 2006...can it not be fixed?

whilst i appreciate that user forums are helpful people trying to resolve my problem it is 7 weeks and it is still not solved. this is not the first time that i have encountered the dreadful "thunderbird is already running" but it is the first time using windows 7. i have tried all the kind advice from forum users and none have worked. do the designers of thunderbird contribute to user forums or is it exclusively for members of the public because i have run out of ideas and my only alternative is using another email service steve

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How do i fix "Thunderbird is already running"

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