If you’re running Windows you’re going to want to run up-to-date antivirus software. There is no need to pay for antivirus anymore because Microsoft Security Essentials is free if you have a genuine copy of Windows (not pirated). It protects against viruses, spyware, and other malware without being a resource hog in return not killing system performance like many other anti-virus’. No anti-virus software is fool-proof so you will still have to browse safely and make sure to run Windows updates, which Microsoft Security Essentials is integrated into. Once MSE is installed it will reside in the system tray in the bottom right hand corner of your task-bar; make sure to keep an eye out for the little castle looking icon and if it’s orange or red, it needs attention.
The download page can be found here: http://www.microsoft.com/security/pc-security/mse.aspx
