Besides the Game Mode option in this Forum Link..
I believe the Loss of Game disrution during AV/AS Updates has been fixed in the 7.0.408.000
Unfortunately, this is not the case. UPDCLIENT.EXE is still stealing focus, every hour on the hour. Turning off the AS auto update feature is a work-around but it definitely needs to be fixed! They should make it check at bootup and either schedule it to check once or twice a day, or make the schedule user configurable. Twenty-four times a day is a bit much.