I found that some AVG kernal wasn't loading at startup and the AVG icon that
showed AVG was active in the bottom toolbar wasn't showing. I found 2 ways
to fix it. One is to open AVG and then click the 'Control Center'. The other
way is to turn off the 'User Account Control" in Vista. To do that, go to
Control Panel/User Accounts/Turn User Account control on and off. Either way
seems to put AVG into Active Mode.
I LOVE FREE AVG!!!