Please make sure you always download updates for java when it asks. We are mostly past the days of operating system exploits (windows isn't as bad as it used to be but they still could use some work). The new way for hackers to get in is through ADOBE READER, FLASH, and JAVA.
So for all you minecraft fans, please make sure you prioritize this. The latest mac trojan was because of a Java exploit.
"But I have an anti virus" I won't go into the details but basically this
https://www.youtube.com/watch?featur...&v=juFZh92MUOY