Follow these steps to enable or disable the protection against known threats:
Click Antivirus in the main window of the program.
On the left-hand side of the window, make sure the Known viruses option is selected.
If you want to enable the protection against known threats, set the control to the ON position. To disable it, set it to OFF.
Note: Bear in mind that if this protection is not enabled, your computer is not protected against viruses and other possible threats.
For more information, refer to the Configuring the protection against known threats section.