WistaAntivirus
WistaAntivirus, or Wista Antivirus, is a rogue anti-spyware program and a clone of WinDefender 2008 that may be installed by a Trojan infection called Zlob. WistaAntivirus is known to display popups and system notifications warning computer users of an infection. This is usually a bogus attempt to get you to purchase the WistaAntivirus program.
Once Zlob is installed, it will display fraudulent error messages, stating that your computer is infected with spyware and adware, only to bully you into fixing the problem with the rogue anti-spyware program is advised by the Trojan. If you download Wista Antivirus, it will start a scan that displays false positives on your computer. It is strongly recommended to remove WistaAntivirus from your system without any hesitation.