I'm using Microsoft Security Essentials (MSE) on a Windows Vista SP2 box. Every day in the 4 PM hour MSE updates itself: The green fortress icon in the notification area displays an animated download arrow, and my computer becomes unusably sluggish for five minutes (or more). I'm generally forced to take a coffee break or read a magazine.
How can I control the time of day when this update occurs? Sometime after 9 PM would be ideal.