We have NOD32 Antivirus Business Edition v18.104.22.168 running throughout our organization (about 300 computers) and everyone is calling the Help Desk about a pop-up they are receiving from NOD32: "The virus signature update file has not been digitally signed! Do you wish to apply this update anyway? Do you want to use this update anyway?" I confirmed that this problem occurs when updating from 8339 to 8340 on all workstations. Why is this occurring? What should the users be selecting? Yes or No?