How to Install Firefox
Locate the file you downloaded, the firefox .exe file. It should be called Mozilla Firefox Setup 2.0.exe or something very similar. Double click on the file to start installation.
Once the install is under way agree to the license and accept the suggested default options.
At one stage in the Mozilla Firefox installation you will be asked whether you want to make Mozilla Firefox your default browser. I suggest you initially answer "no." That way you can test out Mozilla Firefox without altering any of your current Windows settings.
If at a later date you want to make Mozilla Firefox your default browser you can do so by selecting this option from within Mozilla Firefox.
After installation, the Mozilla Firefox Import Setting Wizard will run asking whether you want to import your favorites, internet options, cookies, saved passwords and a variety of other data settings from Internet Explorer. Answer "yes" to all- having all this information within Mozilla Firefox makes for a much smoother transition.