Here's a nasty one:

Trojan FakeAlert  hijacks the desktop background with a graphic alerting the computer user that their computer system has been infected with some type of spyware. Trojan FakeAlert also changes some setting values of windows which include:- disabling permissions so that the computer user cannot change the background graphic and configuring the active desktop to 'show web content'. It is most often installed in conjunction with another nasty rogue anti-spyware program.

Rogue anti-spyware is antispyware that uses malware (malicious software program(s)) or malicious utilities to advertise or install itself or to coerce computer owners to purchase software to remove nonexistent malware. Many times this type of software such as Trojan FakeAlert will often install a trojan horse to download a trial copy of the software, or it will execute other unwanted tasks which is also typical of this type of software. 

In the majority of the cases, the main reason why software makers create these rogues are for the purpose of selling their software.

You can use one of three software products to remove this threat: The PC Tool Internet Security product, the antivirus plus antispyware product spyware doctor with antivirus or last but not least the antispyware product spyware doctor. Either of these solutions will get the job done. It just depends on whether you already have security or not. If you don’t have a firewall, then get the first product. If you don’t have an antivirus, then get the second product. If you just need a good spyware removal program and you have the other security applications, then get the last product. With either of these, Trojan FakeAlert will be history.

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Post brought to you courtesy of Computer Tips By Olan