Get the program here
It's obvious that an antivirus program should be the first companion of any new Windows installation. The problem is, which one should you choose? In our most recent comparison of free anti-virus software, Avast won over six other competitors, including Microsoft's own Security Essentials. The free anti-virus program won praise from our hardworking testers thanks to its performance, accuracy in detecting threats, and (most importantly) user-friendly interface.