I just installed avast home and uninstalled Norton. When I restarted my pc, i got the network shield in the taskbar with a warning that says avast is not up to date. I registered avast and restarted again, and I'm still getting the warning. Also, on the Windows security screen, there is a note under the warning that says "Windows does not detect all antivirus programs." Can anyone give me advice on these issues? By the way, I'm somewhat of a newbie in the pc intelligence arena.