Say I'm a normal Internet user, I visit some well-known social networks like Facebook, twitter, play flash-based games in Facebook, visit some big websites that are known to be safe and trusted and check my emails through email provider's website like Gmail and Outlook. I scan USB pendrives immediately once inserted into Windows computer with an Internet security software like KIS. so what are the chances that I will get hacked or malware find a way into my PC? Browsers like Firefox are disabling Flash player by default but is it a problem if I use it only on trusted websites like Facebook?
2nd. And If I sometimes visit unknown websites too and click on unknown links (but don't download or install anything), will my browser or Internet security software (i.e KIS) protect me?
3rd. what are the chances of a PC, connected to the Internet but doesn't go to any websites and doesn't use CD/USB pendrives etc, to get infected? I mean do hackers look for open ports on the Internet (which takes too much time) or scan IP address in order to find a vulnerable computer, or people get hacked because of the things they do on the Internet? Thanks