FREE COMPUTER SECURITY SOFTWARE
Most of these products have been extensively tested.
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Spyware Control

Microsoft Malicious Software Removal Tool (please read directions)

Ad-Aware SE Personal Edition 1.06

Spybot – Search & Destroy 1.4

Windows Defender (Beta 2)

Windows Errors

WinErrs 1.0
(WinErrs is a database of 1.554 Windows error codes and their definitions.)

Hard Drive Clean Up

File Washer Pro
Simplifies the task of cleaning history, junk files, recent documents lists and other sensitive files.

Firewall

R-tools Technology Firewall Free

Sunbelt Kerio Personal Firewall

ZoneAlarm Free

Registry Fixers

PC MightyMax 
If the news and weather feeds don't work right on your computer, your ActiveX is not installed or corrupted.  This scanner will find any problem and fix it for $29.00 - well worth it.  My computer showed 579 errors.

RegistryTweaker
Like fine tuning your car, only easier.

Registry Wizard
A scanner to identify and correct registry errors

Eusing Free Registry Cleaner
allows you to safely clean and repair registry problems with a few simple mouse clicks

RegClean from Microsoft

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AntiVirus

Avast! 4 Home Edition

AVG Anti-Virus Free

AVIRA Home Edition
(An integrated virus protection suite)

McAfee AVERT Stinger 
(a stand-alone virus removal tool)

F-Secure Fizzer Removal Tool
(stand-alone email virus)

Resplendence RootKit Hook Analyzer
(Stand-alone identifies Windows corruptions)

Symantec W32.Antinny Removal Tool
(Removes this common virus)

Symantec Trojan.Abwiz Removal Tool

RemoveIT 2.4 SE
(A free virus removal tool)

FreeShield 2.0
(Parental control while removing “rogue dialer” scams)

Look2Me Trojan Remover

CleanZT
(Removes components of Zotob worm)

More Trojan Removal Tools 

Panda On-line Tools