Entry Point Not Found Error

This error message began appearing during normal system activation yesterday during the bootup process:

Title: "VPN.exe - entry point not found"

?GetNotifylconMetadata@SysTraylcon@systray@common_ui@asw@@QBE?AUNotifylconMetadata@1234@XZ could not be located in the dynamic link library C:\Program Files (x86)\AVG\Secure VPN\Vpn.exe.

Please advise on how to restore service.