Firefox install causes error messages during startup and freezes during running

I installed firefox 20 on Windows 7 and when I reboot I see several messages telling me that I am missing dll files. I have verified that all the dll files are in the install folder. I was able to run firefox without running firebug and just putting up with the annoyance in clicking ok ont he messages at the start. However when I installed firebug and tried to start I have not been able to use the browser since.

Is this already appearing during the boot process or only after starting Firefox?
You can use the MSConfig program or the Autoruns utility to see which software and services are getting started.
*http://technet.microsoft.com/en-us/sysinternals/bb963902.aspx
Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 20.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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