Note 2 Received the following message "Unfortunately, Mobile Security & Antivirus has stopped". Thought I might have some malware. Tried restarting, removing battery, clearing cache but no luck. Just completed the instructions from Marcus and everything seems to be back working again. Thank you Marcus! I am concerned that this happened at all and that the fix was such that it required going through the entire process of setting up all the various protection settings again. Security problem+try to fix problem+search for solution+apply solution=Hours of wasted time.