Firefox will not open - gives an XULRunner error

I am getting the XULRunner error. I did a "clean install" of the latest version and am still getting the following error:
>XULRunner
>Error: Platform version '11.0' is not compatible with
>minVersion >= 12.0
>maxVersion <= 12.0
What do I do now?

Are you using Windows XP SP1 or SP2 ??
* IF Yes, then upgrade your Windows to SP3
* see this article -> [[Firefox no longer works with some versions of Windows XP]]
Check and tell if its working.

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