Xul runner has showed up not compatible with firefox, wont let me into firefox, how do i fix this problem?

when i try to click on firefox which i use for my internet user a little box pops up which states xul runner error,1.9.29 not compatible with min. version>=1.9.2.9 max vesion<=1.9.2.9 and will not access my firerox. please help me solve this problem.

Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer. Don't remove personal data when uninstalling.
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.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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