Firefox stub 28.0 installer does not open.

Running Windows 7. Downloaded installer (stub 28.0). I tell it to Run and nothing happens. It also asks if i want to run the installer. I respond "RUN" but nothing happens. I get a message that it could not load XPCOM. I have tried it several times with no success. Have downloaded it several times.

Try the full installer instead. Also, don't run it directly, if your browser offers that option. Save it to a location like the desktop, and run it from there.
* http://www.mozilla.org/firefox/all/

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