Firefox seems to download but won't install

I'm running Windows Vista with Norton 360. When I try to download Firefox using Internet Explorer it seems to download - but then won't install and launch.
== Ever since I uninstalled an old version of Firefox, installed Norton and tried to get the latest Firefox ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

We are aware of some campatibility issues of Flash Player 11.3 with Mozilla Firefox.
Please see the following doc for more details: http://helpx.adobe.com/flash-player/kb/flash-player-113-crash-mozilla.html
See the following doc to know which version of Flash Player is installed on your machine: http://helpx.adobe.com/flash-player/kb/find-version-flash-player.html
Thanks,
Sunil

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