Did it only happen when you try to update NOD32 ?
Have you tried to click the Repair Now button in IMON Setup > Miscellaneous ?
Automatically detect changes in network configuration and repair necessary settings - if enabled, IMON will try to repair the LSP chain in order to ensure proper functionality of the network and mail scanner. If IMON keeps repairing configuration on system startup due to another program utilizing the same technique, turn this option off. Click Repair now to force IMON repair network configuration.