Are you seeing a small revolving arrow in the notification area by the clock when this is going on? If so it is VirusScan updating, something it has to do at least once a day. If you only turn on your machine now and again that will happen at every boot.
You could tell the SecurityCenter that you want it to notify you first before updating.
Double-click the taskbar icon to open SecurityCenter
Click Advanced Menu (bottom)
Click Configure (left)
With SecurityCenter highlighted at top left click Advanced (right) under "Protection Status".
Click Update Options and alter to what you want.
I do not recommend turning off updates altogether as you may forget and your protection may fail as a result.
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Hi SimonSimon ,
SecurityCenter checks for updates shortly after a system restart, and checks again approximately every four hours. In the event of an outbreak emergency DAT files could be made available providing the latest virus DATs as shortly after they are posted to minimize the risk of infection. Automatic updates ensure your virus definitions are always up-to-date with the most current DAT version available from McAfee.
That makes sense and so I think I will leave everything as it is - worknig as I would wish!!
Good idea and good luck. ;-)