http://www.bleepingcomputer.com/malware-removal/remove-antivirus-pro-2009 explains how to remove it.
If you are not using Windows Live OneCare (which also can't detecft or remove this malware), you are off topic for this forum. This is not a general forum for viruses, spyware, or Windows Help. For help with spyware issues, you may want to try the forums here:
http://aumha.net/ For help with virus removal, contact the maker of your Antivirus program.
If you are in North America, you can call 866-727-2338 for help with virus and spyware infections. See http://www.microsoft.com/protect/support/default.mspx for details. For international information, see your local subsidiary Support site.
-steve