Tried to load Firefox 4.0 in Window 7 home. Got an error message "Internal Error 500" What to do next?

I loaded Google Chrome but wanted a Google toolbar. It requires to load Firefox. Loaded the Firefox 4.0 into Window 7 home computer. When clicking the Firefox icon, an error message "Inernal error 500" showed up. No Firefox, no toolbar. How to resolved the problem?

You should update to the latest Firefox 3.6.x version:
*http://www.mozilla.com/firefox/all.html
*http://www.mozilla.com/firefox/all-older.html
See:
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox

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''GMail entire message content missing (blank) after header title''
In Firefox, if you have "Adblock Plus" extension.
# "Ctrl+Shift+F" Preferences (or right click on ADP symbol, and choose preferences)
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reference: ''https://support.mozilla.com/questions/896267''

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Make sure that you do not run Firefox in compatibility mode.<br />
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Bookmark and use this;
Download the '''[https://addons.mozilla.org/en-US/firefox/addon/searchreset/ Mozilla Search Reset]''' {web link}
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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/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller]
* [http://general-changelog-team.fr/en/downloads/viewdownload/20-outils-de-xplode/2-adwcleaner AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page])
* [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 to us!

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Thank you for being a part of the Lenovo Family,
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Tried to load Firefox 4.0 in Window 7 home. Got an error message "Internal Error 500" What to do next?

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