I needed AntiVirus (AV) for my new laptop, and since I hate Norton, I quickly uninstalled the free trial version that came pre-installed on my laptop and decided to give avast! a look.
I had read reviews and noticed that it had received several awards, and a quick look at their website indicated that I could use avast! 4 Home Edition free of charge. I quickly installed it, accepted the defaults, and have been happy ever since.
It has a very easy to use interface and works pretty well in the background without being too intrusive. The Home Edition comes with the following features: simple user interface, resident protection, P2P and IM shileds, network shield, web shield, automatice updates, integrated virus cleaner, and support for 64-bit windows.
I highly recommend this product if you are looking for a free tool to use on your home PC.