whatever be the password...the longer it is the more difficult it is to crack using bruteforce.If the hacker is someone closeby and you use easy passws like jone39 or bobby26.3you can be sure as hell that you will be hacked down..Try changing your passwords frequently..Don't write them downthese might act as a safety precaution...
it is a know fact that anti-viruses can't be trusted for security....If you are ever downloading something or using something make sure it is from a safe site...or else you are in for trouble