"Security-Tool" is a trojan program that may appear in a pop-up window on your desktop at affected sites. It will call itself a free security or anti-virus scan that can be downloaded for free
DON'T DO IT!
The program is a virus-like hackerware. It will infest your registry, and when run it will do a pseudo-scan of your PC, calling out hundreds of false viruses, and preventing anything from running.
It is also capable of repairing itself if it is only partially removed, and the site that collects the payments saves your credit card information - numerous accounts of fraudulent credit card charges are also attributed to this malware.
I heard of it from some people I know who keep track of these things. It will tell you that the only way to restore your PC is to pay for and download the "FULL VERSION" - which does not resolve the issues.
Here is an article with more info from Wikipedia:
[url=https://en.wikipedia.org/wiki/Security_Tool]Security Tool - Wikipedia, the free encyclopedia[/url]
This is a maliscious ware, that originated in 2009 under different names, and now masquerades under a likely sounding name that may easily be mistaken as a valid update on some systems.
DON'T buy into it, from what I was told: "It won't even allow SOLITAIRE to run..." That comment came from the voice of experience, and one I don't want to have!
*Now you know another reason I'm called "Greywolf". I look out for things that cause harm, so that me and mine can avoid them