Always have current back-ups of files and operating systems. Disconnect from the Internet when not in use or turn off computer. Do not store important or sensitive data in easily accessible areas of your system or network. Uncheck the option for allowing other users to access your files and printers. This is found under under Control Panel, Network, File and Print Sharing.
Hackers know more about the older software than the newer.
When implementing security features in your system or network, do not have one single point of failure. Try to implement at least two components of security within your system or network. Make a point to stay on top of all the latest relevant security advisories. Educate yourself or someone within your organization to security practices and strategies. Implement security hardware and software in your network or system.