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Malicious hacker attacks against Java vulnerabilities have exploded over the last two years. If you don't absolutely need it (chances are you don't!), immediately uninstall Java from your machine. Removing Java significantly reduces the attack surface and save you from all these annoying checked-by-default bundles that Sun tries to sneak onto your computer.
Update Adobe Reader immediately
Adobe Reader is a major target for skilled, organized hacking groups, especially those launching targeted attacks against businesses. The newest versions --Adobe Reader and Acrobat X contains Protected Mode, a sandbox technology that serves as a major deterrent to malicious exploits. Adobe security chief Brad Arkin says the company has not yet been a single piece of malware identified that is effective against a version X install. This is significant. Update immediately. If you still distrust Adobe's software, you may consider switching to an alternative product.
Encrypt your Web traffic
We all check e-mails or Facebook status updates in coffee shops or on public WiFi networks. It's important to invest in a virtual private network (VPN) to encrypt your activity and keep private data out of the hands of malicious hackers. This video explains all you need to know about the value of VPNs and how to set it up to authenticate and encrypt your web sessions. If you use public computers, consider using a portable VPN application that can run off a USB drive.