Firefox is not visibly running, but says 'cannot start as already running'. How do I stop it?

Firefox comes up with ' is already running....close and restart', but no visible firefox is running and even in task manager it is not running. How do I 'stop' firefox? Restarting the computer did not help
== This happened ==
Just once or twice
== User Agent ==
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)

i have same prob but not just once or twice, regularly-at least once a day- and still does it after restart. it's diving me mad....arghh

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*[[/questions/959058]]
Do a malware check with some malware scanning programs on the Windows computer. 
Please scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
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*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
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Some basic printer troubleshooting steps before worrying about a printer driver:
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Firefox is not visibly running, but says 'cannot start as already running'. How do I stop it?

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