What's a obedient free anti-virus?

My Dell laptop be shipped with a massive resource hog, PC-illin..or something approaching that, and I'd like to install a simple firewall and A/V. I enjoy the free version of AVG but it will be expiring soon. The singular bonus of this PC-illin' is wireless network detection but I'd resembling to find something else. Any suggestions?

Answer:
AVAST is by far the best free anti virus program. I've tried AVG, and Avast does a better job at finding, removing and preventing virus.
avast is good antivirus
I am currently using NOD32 (Ya this is a rewarded version), its really great. But If you want free antiviruses, try the links below:
If you are satisfied beside AVG you can download the new 7.5 text for free also on the Grisoft web site. I freshly downloaded it this morning.

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