How to deactivate antivirus completely?

I have a collection of 3D videos created in 2003 with a German program called Werkzeugg. They have always run perfectly but since updating CIS some get quarantined every time I open the folder that contains them. All are executables and the folder is on a USB drive.

I went into quarantine and restored them at the same time adding them to exclusions but CIS still knocks them out whenever I open the folder. In desperation, I closed my internet connection and exited CIS but it is still doing it.

Short of uninstalling it, what do I need to do to deactivate CIS completely please?