Free antivirus download for windows 7 home premium

Great reading -- Do Antivirus Suites Impact Your PC's Performance?

U can use Avast along with Malwarebytes and Comodo Firewall that is free, but got great results in defending your PC. And u can configure it to your satisfaction with ease.

Avast! -- Free Antivirus

Malwarebytes Anti-Malware -- helps you defeat Malware once and for all

SUPERAntiSpyware -- Advanced Detection and Removal

Comodo Internet Security -- The best free Firewall

Comodo Internet Security is by far the best free security. Their anti-virus is in need of some work. However, Comodo is not exactly tech friendly. It has lots of pop up alert asking for your permission. A good alternative is Zonealarm. Avast is a good product but some good alternatives are Avira and AVG. Malwarebyte is a must  

I thought it is friendly, unless the alerts are set to the high level : )

Nobody needs to know that FW blocked some website, right?

Just my experience wintermint : )

Free antivirus - Microsoft Security Essentials.

Free firewall - Free ZoneAlarm or Commodo.

You can also use the avg free