I just reread the question and my answer is not what you expect. Let me look a little harder.
Open IE7 and click on Tools/Internet Options/Programs
It should say the IE7 is not your default browser. If it does not, then reset IE67 as your default, reboot, then open Firefox and set it as default, reboot. This should do it.
Another alternative to try, go to Control Panel/Add or Remove Programs. On the left click on "Set Program Access and Defaults", click on "Custom" and highlight "Mozella Firefox" as your browser.
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