The following article is located at:
http://www.memphispcguy.com/computer/security/how-to-prevent-scareware-rogue-antivirus
I did not contribute to this article, but it contains great advice and information. Again- this is a direct copy of his posting and I cannot claim any recognition for any of the wonderful information below. Enjoy!
How to prevent “Scareware” (Rogue Antivirus)

The authors are actually paying people to infect you, which means it is being included in blogs, forums, even websites you actually pay to use. Typically they rely on your trust of a website to open up the security of your web-browser, to drop your guard, to OK a download.
They operate primarily by using Javascript Code. Javascript is very common and the internet would be a horribly bland place without it, which makes it the perfect vehicle. Javascript are little snippets of code that are included in websites to generate dynamic content, like time stamps and the like. They allow a website to offload some of the heavy lifting and use your computer to assist in customizing the website being shown to you.
So, how to prevent at least casual infection while you are out searching the internet for the latest Tiger Woods gossip? Prevent Javascript from running unless you want it to. The upside will be no more of those “Punch the Monkey” Ads as well!
Most computer techs will tell you to use Mozilla Firefox as it does not allow ActiveX, Microsoft’s version of Javascript and that is a good start, but some sites rely on it more than Javascript. You can manually set your browsers to disable or notify you of every java/activeX script attempting to load, but you would quickly be overwhelmed by the pop-ups asking permission.
Whether you use Internet Explorer or Mozilla Firefox, there are now add-ons that disable Ads and scripts until you tell the add-on the website is ok. Usually they will add a notification bar or an icon in your browser to alert you that a script was stopped. At that point you have a decision to make. Do you really need to see what is missing (for example, are you trying to Buy something but there is no Buy Now button, are pictures missing you wish to see etc.) If you said yes, you would then use the Add-On to Authorise that website only. When you authorise that website, make sure you only allow that specific domain-name, so for this website, if you want to see all the little bells and whistles of this blog you would only authorize www.memphispcguy.com. Generally you can trust the primary domain name, but not some stranger domain or 3rd party site. Of course, you will be blocking Banner Ads and Google Analytics that may cost the website owner some income, but considering the cost of cleaning scareware it is a small price to pay until something better comes along.
The use of noscript add-ons will take some getting use to as you will be required to assess the websites worthiness before allowing it to fully present itself and if your tweenager comes behind you and disables it entirely you may be no better off, but as far as pandemics go, scareware is the latest online scourge and we have to do something.
Browser Add-Ons;
Mozilla Firefox Users: Click Tools > Add-Ons and install Ad Block Plus and NoScript
Internet Explorer Users: Download and Install Simple Adblock
Internet Explorer Users: Download and Install Simple Adblock
More Advanced users may be interested inOpenDNS. It replaces your Internet Service Providers Domain Name Servers. With a free account you can have it redirect/block porn, piracy and virus websites. Like anything there is a slight learning curve and some advertising from OpenDNS themselves, but if set up correctly it will help protect your entire open network rather well.
This article could go on and on, there are as many security solutions as there are scareware variations, but I had to start somewhere and I prefer it not to be at your house trying to save your data.
Mike Oyler
Memphis PC Guy
Memphis PC Guy
Source: http://jaxcomputing.blogspot.com/2010/08/another-post-on-rogue-antivirus.html
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