Oppps, sorry for putting that link. My work's laptop has McAfee AV+AS enterprise, plus other anti-malware stuff. If I were using Windows XP SP2, Microsoft Internet Explorer or Opera, it would have automatically loaded in my computer. I'd fixed a Windows XP SP2 recently the user said this Antivirus 2009 just popped up in his computer even if has the same McAfee like what my laptop got....
GET /?aff=1O5O HTTP/1.1 Host: scanner.power-antivirus-2OO9.com Connection: close
I used Spybot_S&D before. It has option to prevent your computer from accessing rogue sites by editing hosts file, mostly at C:\Windows\System32\Drivers\Etc\hosts because mine has D:\Windows\System32\Drivers\Etc\hosts. In this case if I add a a line like "127.0.0.1 whatever.power-antivirus-2009.com" my Web browser will now says, "Internet Exploder can’t open the page “http://whatever.power-antivirus-2009.com/?aff=1050” because it could not connect to the server “whatever.power-antivirus-2009.com.”
Actually I've been editing hosts file for quite sometime even now before seeing it with Spybot_S&D mainly to block annoying unwanted pop ups and ad banners. By the way, when scanning Windows XP's using McAfee Anti-virus with the McAfee Spyware Enterprise Module, it tend to mess up the hosts file, so I added "D:\Windows\System32\Drivers\etc\hosts" (or C:\...) in the "Set Unwanted Progam Exclusion" and do "attrib +s +s +h C:\Windows\System32\Drivers\etc\hosts" every computer in my domain. So far so good almost all business computers I maintain seldom get infected.
Also, make sure you have the latest version of Windows installed. Check if your version of Windows is up-to-date at: Windows Update. Use the "Custom" button. This way you also get the "Optional" updates as well as the "Critical" updates/patches.