Unable to instal Firefox 3.6 on Window Vistadue to "unknown publisher" error

I've jsut reinstalled Window Vista on a new HD due to a carshed HD. When I tried to install Firefox 3.6, after downloaded the .exe and try to install, Internet explorer immediately pops up a window and it says "unknown Publisher" and blocked the installation without giving any option to ingnor it and continue the installation. What should I do ?

As I have said you have some pretty old software and the problems so far will likely be your typical experience in using it.
You have 10.1. There are five updates for that 10.1.1 through to 10.1.5
perform the updates as required to reach 10.1.5
You may have to do them in order depending what version your have.
This wiki page below has a convenient collection of update links to Apple at the bottom.
http://en.wikipedia.org/wiki/MacOS_Xv10.1
Which particular version you have is found under the Menu item  About this Mac, will tell you the version.
After you have installed the last update,
download this utility from here
http://docs.info.apple.com/article.html?artnum=106900
and run Repair Privileges.
You really should consider a later Mac OS like 10.3 or 10.4 if you can afford it.

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