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Well first of all, microsoft would never send you a message to download and install something. So you got phished.
Second, whatever microsoft would have installed, would not have cared less about firefox so it wouldn't have singled it out and instaled something to it.
Chances are likely you downloaded malware or even a virus and you need to remove it. Run your virus scanner and see what comes up. Download and run Spybot S&D and see what comes up. Also there is a HiJack sticky thread here, you can install HiJackThis and do a scan then post the log for others to take a look at.
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