Can no longer open firefox; profile showed lock-uninstalled and reinstalled, still cannot access

For years I have used Firefox-suddlenly it will no longer open (can access sites with another browser). After spending hours reading forums, self-helps, etc I tried looking at the profile and it had a parental.lock shown on it. I am the administrator of the computer so I know it is not computer related. I tried deleting the lock (which I appeared to be successful at, rebooting the computer but still could not access Firefox.
I then uninstalled and reinstalled Firefox and am getting a message to close the previous version of Firefox. The update will not launch.
Can someone PLEASE, PLEASE help me?

Do you have any idea where the parental lock came from?<br>
You are running Windows Vista. Correct?
Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back soon.

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Can no longer open firefox; profile showed lock-uninstalled and reinstalled, still cannot access

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