Firefox window will not open - firefox.exe closes by itself

Hello,
I have a problem with Firefox not being able to start when I double-click the icon on my desktop. I'm not sure what version I was using before, but I uninstalled whatever version I had before and installed the latest version (14.0.1), with no effect.
I can see that when I try to open Firefox, the firefox.exe process will stay open for about five seconds, then disappear. I've tried to open Firefox in Safe Mode and open the Profile Manager via the command line, but the window never opens, the process always appears for a few seconds and disappears on its own.
Anybody know what is causing this or how it can be fixed?

Hey, thanks for all the help so far. Sorry for the late response.
I followed your instructions, even getting rid of my bookmarks and personal data when uninstalling, and here's what happened:
After installing, I kept "Launch Firefox" checked at the last prompt. A window opened, it asked me whether I wanted to import anything from other browsers, I said no. Then it opened the regular Firefox browser window! But, I closed it and re-opened Firefox just to make sure it would still work...then it did the same thing it was doing before, opened for a few seconds and then closed on its own without opening the window. :-( So, it would open only once, the initial time and then that's it.
I don't get a crash reporter at all. No visual confirmation that Firefox is trying to open, except the process appearing a few seconds in the Task Manager and disappearing.
My antivirus program is AVG Anti-Virus Free Edition 2012. I do virus scans with Malwarebytes Anti-Malware occasionally. I don't have Windows Firewall turned on right now because it caused problems with another application.
This problem is particularly pesky...I don't know what happened, until a couple of days ago Firefox was running fine...
Any further help or suggestions would be appreciated!

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