If you are not using
Windows Live OneCare, 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:
www.bleepingcomputer.com or
http://aumha.net/
Your PC is infected by fake antivirus software.
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
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~