When I try to start Firefox, I get a message saying that Firefox is already running and cannot be re-started, so close down and reboot.

Following an upgrade of my OS from XP to Vista, I tried to point the new installation at my old profile. Now when I try to start FF, I get a message saying that it is already running and I should reboot to clear the problem. I've done that but the problem remains. I have uninstalled firefox and reinstalled v4 beta. The problem remains. Any ideas?

OK, I had moved the profile file inside the profile folder which was created when I installed FF, to the main FF folder. I then took the equivalent file which existed under XP before my upgrade to vista, and moved it into the new Profile folder. That's when I hit the problem described in the initial question.
So, what I did following Tony's response was to move the bookmarks password and cookies files into the profile created on the install. I then moved that file into the profile folder and moved the one I'd saved from XP, out to the main FF folder.
Started FF and voila! All working fine. Thanks for your help.

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There are a few possible causes for that error, for details see [[Firefox is already running but is not responding]].

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See this Apple document for help...
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When I try to open Firefox, I get a message saying that firefox is already currently running, although it is not running. Close and try again or restart computer. How can I fix this?

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https://support.mozilla.com/en-US/kb/Firefox%20hangs <br />See '''hang-at-exit'''

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tt2

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Apple Mobile Device Support (if this won't uninstall move on to the next item)
Bonjour
Apple Application Support
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HT1925: Removing and Reinstalling iTunes for Windows XP
HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
tt2

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I have recently started downloading video files. I
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have a look at this support article.

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Hi did you ever get a solution to this problem? Having the same issue myself!

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Hi OverratedBacon,
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http://support.apple.com/kb/ht2519
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http://support.apple.com/kb/ht1933
Cheers,
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When I try to start Firefox, I get a message saying that Firefox is already running and cannot be re-started, so close down and reboot.

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