Microsoft Security Essentials
Seriously great antivirus protection that’s seriously free
Now you can work–and play–on your
PC more safely. With Microsoft®
Security Essentials, it’s easy to help
protect your home or small business
PC from viruses, spyware, and other
malicious software for FREE* with the
same award–winning technology used
by millions of consumer and enterprise
PCs around the world.* Your PC must
run genuine Windows to install
Microsoft Security Essentials.