Many anti-viruses are now in market to use for free or to buy .
In my work IT suggests Microsoft Forefront client security antivirus and sen us a link to updates regularly .
I loved it because of easiness,simplicity and lightness.
But when I tried to install it at home it gave me error messages.
After many tries I could install it after installing two updates for Windows and it works now very good.
1- You can Get it From here...( I included Forefront Client Program) sdrv.ms/TypanK