Then change the avast Settings, Updates for VPS Updates.
If you don't intend to use these Shields you should remove them, unlike 4.8 if you have a shield installed if it isn't running this is going to remind you.
So using windows Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Change, uncheck the Shields you don't use P2P and IM (the rest are essential I feel) and OK your way out. This completely removes those shields and no more unsecured notification. If you need them in the future all you need do is reverse that process, adding the shield/s that you need.