Viruses: Antivirus software to avoid

Antivirus, Internet Security
Computer Protection Software
Comparisons, Reviews and Information
from Certified Security Experts and End Users

Prevention
Certification
Filtering
Features
Selection
Configuration
Avoid

BitDefender
eTrust
F-PROT
Kaspersky
McAfee
Norman ASA
Norton
Panda
PCSecurityShield
PC Tools

Avoid software:

That doesn't have real-time protection. Sometimes this is inaccurately called 'on-demand' scanning (Despite that being something else.), sometimes it's called 'on-access' scanning. Whatever it is, it means that files are scanned when they are launched or loaded into memory. Your AV software must have that.
Without automatic definition updates. As we say on the configuration page, non-updated antivirus software is worthless.
That doesn't let you scan an entire disk manually, or at scheduled intervals.
That doesn't let you manually select and scan a file, usually via a the right-click content menu in Explorer.
That doesn't present detailed information about viruses found.