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Each time I open a webpage I receive the following JavaScript Application warning: "TypeError: Components.classes[TvtPwmComponent_CID] is undefined." Webpages do open after I cancel the warning.

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I have a Lenovo W500 laptop with M/S Windows 7, 64-Bit operating system and M/S Office 2010.

I have a Lenovo W500 laptop with M/S Windows 7, 64-Bit operating system and M/S Office 2010.

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That indicates that the ThinkVantage Password Manager is not working, it is probably not compatible with Firefox 4. If you disable or uninstall that extension you should no longer get the errors - https://support.mozilla.com/kb/Uninstalling+add-ons

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That appears to have solved my problem - thanks!