Hi, I use Kaspersky Antivirus in my machine. Its awesome! It has got a simple interface, less than 50 MB installation and does not offer major configurstion options. It has only got three settings for real-time scanning and on-demand scanning, that is low, medium and high. Offers, regular virus updates and that is it. So what makes this russian av the best? read on! It offers the best real time scanning. It scans every damn thing you do in your computer (except mouse and cursor movements!!). Opening a file, copying, moving, deleting, insert a CD and it does a very quick scan, and every instance of a Window is scanned, run a software, its instance is also scanned, every new process and threads are scanned too. When u connect to the Net, every web page being downloaded will be scanned. ( I came across so many website, which just by visiting puts Trojans in your machine!!. If not for KAV, ....!!!). Even if a file is downloaded say using a download manager in different parts, each part will be regularly scanned. It also protects ur machine from hacker intrusions, Trojans...etc So, get a copy and make ur computer a almost total secure place!!!