Can't open FF4, and I get a Vista Home Security 2011 error message

Question

I downloaded FF v4 on my Dell laptop running Vista. FF worked fine, so I downloaded Aniweather, Forecastfox weather, and something else that I can't find now all from the Mozilla website.
I tried to adjust the weather to my locale from the default New York City. Then everything went to crap. I got a pop-up from Vista Home Security 2011 that ran a scan, then told me I had 31 infections of Malware and trojans. Then it told me I had to subscribe to it's services to remove the infections.
Then I tried to open FF4 and nothing happened. So I tried to open Internet Explorer and it won't open either. The Vista Home Security keeps popping up and acts like a trojan, so I haven't done anything with it. How can I find and remove everything I downloaded from Mozilla?

Answer 1

Vista Home Security 2011 is a rogue application. Try running several malware scanners to ensure your computer is not infected. It is best to run several as each will pick up things that the others miss. Some scanners you can try are:
* Malwarebytes - http://www.malwarebytes.org/mbam.php
* SuperAntiSpyware - http://www.superantispyware.com
* Ad-Aware - http://www.lavasoft.com/products/ad_aware_free.php
* Windows Defender - http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
* Spybot S&D - http://www.safer-networking.org/en/home/index.html