What are the best sites for free antivirus software?

http://free.grisoft.com/

What are the best sites for free antivirus software?virus scan

Check out http://www.free-software-catalog.com/

It's one of the best sites for free software in many categories.

What are the best sites for free antivirus software?anti virus scan

http://free.grisoft.com/doc/2/lng/us/tpl...
Here are some good choices for free PC security applications:

firewall:

Comodo (http://www.comodo.com), or

PC Tools (http://www.pctools.com/firewall), though Comodo will be a bit easier to use.

antivirus:

Avira (http://www.free-av.com)

AVAST! Home (http://www.avast.com)

AVG (http://free.grisoft.com)

all provide realtime protection and automatic updates.

antispyware:

Spyware Terminator (http://www.SpywareTerminator.com) or

Spyware Doctor (http://pack.google.com)

either one will give you good, realtime protection, along with

Ad-Aware Free (http://www.lavasoftusa.com/products/ad_a... and

Spybot S%26D (http://www.safer-networking.org/en/downl...

for additional removal ability.
You can download a free norton software which is recommended by Google.Also there are some good free anti spyware tools.

http://freegooglepack.blogspot.com
Avira AntiVir PE Classic: http://www.free-av.com/