[Ecks]

Always stay up to date, regardless of OS. An anti-virus suite is only as good as it's user, I have had to do factory resets on many many computers from clients who have anti-virus, anti-malware, anti-out the ass protection, but never paid it any attention til it was far too late.
I however don't use any of that myself, I use Linux and stay up to date.
Don't know much about the kik autoer but you should always be weary of what you download and scan anything you can(minus game cracks that are auto deleted by protection software).