Firefox won't run once I download it

I went on the Mozilla website to download Firefox. I clicked "Run" on the popup box and it downloaded. I then clicked "Run" again to begin installation, and nothing happened. The little box went away, and there's no Mozilla files on my computer. I tried this twice and the same thing happed both times.

Please do the following.<br><br>
#Using Internet Explorer 7 or 8, click this link: [http://www.mozilla.com/products/download.html?product=firefox-5.0.1&os=win&lang=en-US Download Firefox 5.0.1]<br><br>
#When you see the popup, click "'''Save'''" (''do not click "Run"'') and save the file to your desktop.<br><br>
#After the download completes, click '''Tools''', then '''Internet Options''' in Internet Explorer.<br><br>
#Click the "Programs" tab and remove the checkmark from "'''Tell me if Internet Explorer is not the default browser'''".<br><br>
#Click Apply/OK to close the dialog box.<br><br>
#Double click the file you downloaded called '''firefox 5.0.1.exe''' to start the installation.<br><br>
#After it installs, Firefox creates a desktop shortcut so click that to launch it.<br><br>
#Click the orange Firefox button top left and go to '''Options '''| '''Options '''and then click the '''Advanced '''button in the menu which appears. That's the one on the far right at the top.<br><br>
#In the General tab, checkmark the following: "'''Always check to see if Firefox is the default browser on startup'''" and then click the "'''Check Now'''" button.<br><br>
#Click OK to close the menu.<br>
You are now ready to go.
First port of call will be to add a few extensions which you'll find here: https://addons.mozilla.org/en-US/firefox/?browse=featured
I suggest the following:<br><br>
* '''Adblock Plus''' to block ads: https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/<br><br>
* '''Status 4-Evar''' to restore the status bar: https://addons.mozilla.org/en-US/firefox/addon/status-4-evar/<br><br>
* '''Context Search''' to allow you to use the right click menu to search with: https://addons.mozilla.org/en-US/firefox/addon/context-search/<br><br>
* '''Add To Search Bar''' to add to existing search engines: https://addons.mozilla.org/en-US/firefox/addon/add-to-search-bar/<br><br>
I'm sure you'll find many more yourself. ;)

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