Global Village Software

RootKit

F-Secure BlackLight
F-Secure BlackLight Rootkit Elimination Technology detects objects that are hidden from users and security tools and offers the user an option to remove them.

RootkitRevealer by SysInternals
RootkitRevealer is an advanced rootkit detection utility. It runs on Windows NT 4 and higher and its output lists Registry and file system API discrepancies that may indicate the presence of a user-mode or kernel-mode rootkit

RootKit Hook Analyzer
RootKit Hook Analyzer is a security tool which will check if there are any rootkits installed on your computer which hook the kernel system services.

Adware

Ad-Aware Personal
Ad-Aware Personal provides advanced protection from known data-mining, aggressive advertising, Trojans, dialers, malware, browser hijackers, and tracking components. This software is downloadable free of charge.

Spybot-S&D
Spybot - Search & Destroy can detect and remove spyware of different kinds from your computer. Spyware is a relatively new kind of threat that common anti-virus applications do not yet cover.

Spyware

Windows Defender from Microsoft
Windows Defender (Beta 2) is a free program that helps you stay productive by protecting your computer against pop-ups, slow performance and security threats caused by spyware and other potentially unwanted software.

SpywareBlaster
SpywareBlaster can help keep your system spyware-free and secure, without interfering with the "good side" of the web.

SpywareGuard 2.2
SpywareGuard provides a real-time protection solution against spyware

Viruses

AVG Free
AVG Free for Windows is a free anti-virus protection tool developed by Grisoft for home use.

AntiVir PersonalEdition Classic
Protection and security against viruses, worms, Trojan horses and dialers

Avast! 4 Home Edition
avast! 4 Home Edition is a full-featured antivirus package

BitDefender 8 Free Edition
BitDefender 8 Free Edition is your chance to use one of the world's most effective antivirus engines for free!

CWShredder
CWShredder™ finds and destroys traces of CoolWebSearch. CoolWebSearch is a name given to a wide range of different browser hijackers. Though the code is very different between variants, they are all used to redirect users to coolwebsearch.com and other sites affiliated with its operators.

Grisoft/AVG Virus Removal Tools
We provide you with a list of specialized utilities for virus removal. The utilities can be used to remove of some of the most common viruses. The list is updated on regular basis.

Firewall

Safety.Net
Safety.Net 3.61 offers Internet security, content security and advanced Internet firewall protection for all your LAN computers, and trust controls to block unwanted or harmful applications from accessing the network.

Zone Alarm
ZoneAlarm provides you with easy-to-use protection against spyware, hackers, and identity thieves.

Hijacking

HijackThis
A general homepage hijackers detector and remover. Initially based on the article Hijacked!, but expanded with almost a dozen other checks against hijacker tricks. It is continually updated to detect and remove new hijacks. It does not target specific programs/URLs, just the methods used by hijackers to force you onto their sites. As a result, false positives are imminent and unless you are sure what you're doing, you should always consult with knowledgable folks (e.g. the forums) before deleting anything.