Run windows update and anti-virus update on a regular schedule.
Disable java.
To unplug Java:
In Firefox, select "Tools" from the main menu, then "Add-ons," then click the "Disable" button next to any Java plug-ins.
In Safari, click "Safari" in the main menu bar, then "Preferences," then select the "Security" tab and uncheck the button next to "Enable Java."
In Chrome, type or copy "Chrome://Plugins" into your browser's address bar, then click the "Disable" button below any Java plug-ins.
In Internet Explorer, follow these instructions for disabling Java in all browsers via the Control Panel. There is no way to completely disable Java specifically in IE.
Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing. - Helen Keller