Recently there has been news about browser security, notably Java and IE updates.
The U.S. government (Department of Homeland Security) issued a warning late last week asking users to temporarily disable Java on their machines. There was a large flaw discovered in a recent version.
Follow this link to disable Java on your machine and keep it safe from this vulnerability. Once a fix is supplied by Oracle, you should update your Java install, and then you can re-enable Java.
The zero-day flaw in IE6, 7, and 8 has surfaced again. Make sure that you install the latest version of Internet Explorer that your operating system supports. If version 8 is the latest version of IE you can install, make sure you apply the Windows Update Microsoft is releasing today and then reboot.