Windows Antivirus 2009 is a virus. Whatever you do, DO NOT
INSTALL OR DOWNLOAD IT. Use a trusted program such as AdAware or
SpyBot to track down malware, and AVG for viruses.
If you do install Windows Antivirus 2009, it will block the
Windows Installer Service, preventing you from installing a real
antivirus on your computer after the fact, making the program
incredibly difficult to remove.