If your PC / Laptop is running with "Genuine Windows" not with pirated windows then you may install the free antivirus software, the name is Microsoft Security Essentials.It is very simple to install and easy to use.It provides a good protection for your PC and doing scheduled scanning of Full System as you set date and time.It runs quietly and efficiently in the background, so no interruption while working on PC.
To Download MSE Antivirus - Click here
What is Genuine Windows -
Genuine Windows is authorized operating system published by Microsoft, properly licensed, and supported. With genuine Windows you get access to support, updates, and downloads to help you get the most from your PC.
To Buy Genuine Windows from Microsoft - Click here
