AnVir Task Manager - can perform several very useful things on your computer.
System speed-up: sometimes you have tons of programs in autostart. You don't use some of them. AnVir Task Manager will help you to remove them from your system's auto-start.
Protection: AnVir Task Manager is not a full antivirus, but can check your system for some viruses. If AnVir Task Manager finds a new record in the registry, it will inform you about it.
And some more things.
Download AnVir Task Manager

SpywareBlaster v3.3 - a tool for catching spies. SpywareBlaster has the database of spyware programs and sites which distribute such software. SpywareBlaster is a freeware.
Download SpywareBlaster v3.3 here

McAfee AVERT Stinger 2.5.2 - new version of an anti-virus. McAfee AVERT Stinger scans for most popular viruses, trojans and worms.
Download McAfee AVERT Stinger 2.5.2 here

Webroot Spy Sweeper Version 3.5.0 (Build 189) - utility for finding and removing trojans and other spies and worms, which try to hack your privacy from the internet.
Download Webroot Spy Sweeper Version 3.5.0 (Build 189) here

Kaspersky Anti-Virus Personal 5.0.227 - a very good anti-virus program.
Download Kaspersky Anti-Virus Personal 5.0.227 here

McAfee AVERT Stinger 2.4.4 - small anti-virus program which can scan for most popular troyans/worms.
Download McAfee AVERT Stinger 2.4.4 here

DrWeb has been updated. In this version DrWeb 4.32b antivirus is integrated with the Security Center in Windows XP SP2, checks win nt/2k/xp services along with the auto-run files.
Download DrWeb 4.32b here

Small anti-virus recognizes most popular troyans/worms - McAfee AVERT Stinger 2.4.3 was updated.

Symantec Norton Anti Virus. Download here (everything included!)

AntiVir Personal Edition 6.28.00.00 - free antivirus, determines (and removes) viruses, troyans, macro-viruses. Has it's own monitor and auto-update feature.