Free Antivirues Download

avast!
Avira
AVG Anti-Virus
BitDefender
BullGuard
CA Anti-Virus
Cisco Security Agent
DriveSentry (antivirus, antispyware and HIPS technologies)
eSafe
Fortinet FortiClient End Point Security
F-PROT
F-Secure
G DATA Software
Kaspersky Anti-Virus
LinuxShield
McAfee VirusScan
nProtect
NOD32
Norman ASA
Norton AntiVirus/Norton 360
Panda Security
PC Tools AntiVirus
Rising AntiVirus
Sophos Anti-Virus
Trend Micro Internet Security
Vba32 AntiVirus
Windows Live OneCare
ZoneAlarm

[edit] Freeware
avast! Home Edition (registerware - home use only)[1]
Avira AntiVir Personal - Free Antivirus (nagware - home use only)
AOL Active Virus Shield (discontinued)
AVG Anti-Virus Free (registerware/nagware)[2]
BitDefender Free (lacks an on-access scanner)
Comodo AntiVirus (home and business use)[3]
DriveSentry (some paid features)
F-PROT for Linux, FreeBSD, MS-DOS
Malwarebytes AntiMalware (on-demand scanner is free; real-time protection is one-time fee)
PC Tools AntiVirus Free Edition
Rising Antivirus Free Edition