"Halt! Critical System Warning" fake warning message is a part of VistaAntivirus2008 (or Antivirus 2008) infection. If user gets "Halt! Critical System Warning" warning messages this means that his/her PC is already infected with the rogue antispyware program. "Halt! Critical System Warning" message appears after fake video codec installation (ex. Video ActiveX Codec, Video Activex Object Error) that actually install Trojan Zlob.

VistaAntivirus2008 (or Antivirus 2008) is a rogue antispyware software that tricks and scares users by showing fake warning messages like "Halt! Critical System Warning". Vista Antivirus 2008 and other rogue antispyware programs show fake scan results and try to trick users into buying their "full" version. Do not trust "Halt! Critical System Warning" fake warning massage and delete it as soon as possible from your PC!