NOD32kui.exe Stopped Working on Vista Startup

I'm running Vista Home Premium, 32 bit with UAC enabled. From time to time I would receive an annoying message on OS startup that says 'NOD32kui.exe has stopped working', clicked OK and NOD32 control center would not show up on the taskbar. This seems to happen few and far between, at random and with no indications whatsoever: I have not installed any software or tweaked any system settings that may have brought the issue. Although a system restart would usually fix this and bring the control center icon back to the taskbar, I'm very puzzled and eager to know what's going on...

Any comments would be appreciated, thank you.