Trojan-Spy.win32.BHO, being a Trojan name that VistaAntivirus2008, MicroAntivirus2009, Micro Antivirus 2009 makes use of, is a phony warning message, used to alarm users into thinkign their computer is infected. Trojan-Spy.win32.BHO message infiltrates a user‘s computer via Fake video codec (like Video ActiveX Codec, Video Activex Object Error) installation. Important to note: these codecs are actually a Trojan zlob. The intention behind all the Trojan-Spy.win32.BHO is to ensure the infected system‘s user purchases the "full" version of VistaAntivirus2008, MicroAntivirus2009, Micro Antivirus 2009 renegade anti-spyware software or other spyware, fro example: VistaAntivirus2008, MicroAntivirus2009, Micro Antivirus 2009. Once the user clicks on the Trojan-Spy.win32.BHO warning message, their browser will immedaitely be redirected to the website where the user is able to purchase the "full" version of VistaAntivirus2008, MicroAntivirus2009, Micro Antivirus 2009. However, VistaAntivirus2008, MicroAntivirus2009, Micro Antivirus 2009 should not be trusted as it is a renegade anti-spyware software. It is recommended that once the virus is detected it be removed formt eh system instanly.