Is is unfortunate that the automatic update requires a reboot each time. This is very annoying and sometimes I have unfinished work and do not want to reboot, and only put my computer in standby mode at night to save energy. My previous Anti Virus software didn't require this every time, and only very occasionally which would be acceptable.
Does this mean that until the computer is rebooted that the new anti virus definitions are not valid until a reboot?