When you boot your computer, you anti-virus usualy don't start completely immediately.
Most of the time, the manager part start first, before every components have a chance of effectively starting. The manager detect that the other parts are not, yet, active and isue the warning.
The manager then proceed with loading the diverse modules and starting them.
If you wait a little, then, every components will get loaded and initiated, and the warning will go off by itself.
The warning appearance is normal. You don't have to wory about it unless it stays on for several minutes.
Electro
January 2012