Social Engineering - you are but tricked into accepting the application, installing it and running it, thinking it comes from a good Source. This site virus removal has good infos about virus removal while this one computer virus removal will give you good Tips about virus removal.
Trojan viruses - these viruses enter the user's Computer along with other fake applications such as browser plug-ins, Video/Audio codecs, free online malware scanners or e-mail attachments. When such a virus (Trojan) has infected your system, expect it to start downloading and installing a Trojan FakeAV.
SEO poisoning technique - Search Engine Optimization, also called SEO, will use the different functions and algorithms coming from popular search engines to push some compromised sites way up in the search results shown by those engines. These methods are also used by rogue software vendors, who place their URLs at the top of the search results for important queries such as recent news events. The moment you are going to click any of those URL, you will be redirected to a compromised website that will push some Trojan FakeAV unto your computer system.
Once such a program has infected your PC, it will Auto start itself and stay resident each time you do start your computer. It will also generate fake security warnings that the user's system is under threat in various ways. Such program will also disable or block applications like: Task Manager, the Registry Editor, the System Restore. All of them could be used of course to remove such program. The Trojan FakeAV will also disable, or even delete, any antivirus program it will find on your system.
This kind of bad application, Trojan FakeAV, has as main purpose to try to steal your money a way or another. So, to get your money into buying some full version of this program, the Trojan FakeAV will claim the actual version is but the trial one and only the paid version can effectively clean your system from all the previously reported threats detected. Other methods include promoting another Trojan FakeAV that can apparently 'do the job better' or 'perform housekeeping tasks on the system'. Another gimmick is to claim that if the user buys the 'full' version, the vendor will donate a small sum to some charitable cause such as environmental protection. You should keep in mind that such application, Trojan FakeAV, will always tell you false things and not the truth.
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