Free Antivirus:
BitDefender10: Antivirus software - BitDefender - The future of security now!
Avast: FREE antivirus software with spyware protection: avast! Home Edition
AVG: AVG Free - Download installation files & documentation
Avira AntiVir: Free antivirus - Avira AntiVir
PcTools Antivirus: PC Tools AntiVirus - Free Anti Virus Download and Removal
ClamWin: Download ClamWin Free Antivirus for Microsoft Windows
Comodo: AntiVirus Download Comodo Free Anti Virus Software Internet Security (Does not work in VISTA)

Free Security Suites:
McAfee VirusScan Plus - Special Ed. from AOL: AOL Security Central: McAfee VirusScan Plus -- Special Edition from AOL - Discover AOL
CyberDefender: CyberDefender Products
PCLive Security: For PC’s Sake

Free Firewalls:
Comodo: Free Firewall Antivirus Software Download by Comodo
Agnitum Outpost: Outpost Firewall FREE
ZoneAlarm: Internet Security Products - Antivirus Software, Spyware Removal, Virus Protection - ZoneAlarm
Ashampoo: http://www2.ashampoo.com/webcache/ht...t_2_0050__.htm
Jetico: Jetico - Jetico Personal Firewall v.1
Filseclab: Filseclab Personal Firewall, Free firewall, Open source code
R-Firewall: Free Firewall comparable with commercial firewalls
SoftPerfect: SoftPerfect Personal Firewall
Sygate: Free Download - Sygate Personal Firewall 5.6 - Security: System, Network, Internet - Simtel.net
Pc Tools Firewall Plus: PC Tools Firewall Plus - Free Firewall Download
Microsoft: Downloads | Software Downloads | PC World (Windows Vista Firewall Add-On - Outbound Traffic)

Free AntiSpyware:
SpyBot Search & Destroy: Home do Spybot - S&D
AdAware: Ad-Aware by Lavasoft - Antivirus software, free spyware removal, firewall
AVG: http://free.grisoft.com/doc/download...yware/us/frt/0
Spyware Terminator: Free spyware removal and spyware protection - Spyware Terminator
Arovax: Arovax AntiSpyware
CWShredder (Trend Micro): http://us.trendmicro.com/us/products...der/index.html
A-Squared: a-squared Free - Free of charge Anti-Virus, Anti-Trojan, Anti-Spyware, Anti-Dialer and Anti-Worm Software - Freeware!
SpywareBlaster: SpywareBlaster | Prevent spyware and malware. Free download.
SUPERAntiSpyware: SUPERAntiSpyware.com - AntiAdware, AntiSpyware, AntiMalware!
Windows Defender: http://www.microsoft.com/athome/secu...e/default.mspx
SpywareGuard: SpywareGuard
eTrust PestPatrol: http://www.pestpatrol.com/details.htm

Free Anti Spam:
Comodo: Antispam Software Download Free Antispam from Comodo™
Mail Washer: Mailwasher Free Spam Filter Software: The Reliable Free Spam Blocker | MailWasher - Mailwasher Free
SPAMfighter: Download SPAMfighter Free! - SPAMfighter
Antispam Scanner: Free Antispam Scanner - FREEWARE Spam Blocker and Filter for Windows

Free Anti Rootkits:
AVG: http://www.grisoft.com/doc/download-...otkit/us/crp/0
Ice Sword: Anti Rootkit Software - IceSword
Sophos: http://www.sophos.com/products/free-...i-rootkit.html
Hook Explorer: http://labs.idefense.com/files/labs/.../HookExplorer/
RootkitRevealer: http://www.microsoft.com/technet/sys...tRevealer.mspx

Free Online Security Check:
Kaspersky: Best Online Anti-Virus Scanner & Free Virus Scan - Kaspersky Lab
Trend Micro: Trend Micro HouseCall - Free Online Virus and Spyware Scan - Trend Micro Europe, Middle East and Africa
McAfee: Antivirus Software and Internet Security For Your PC | McAfee
BitDefender: Antivirus software - BitDefender - The future of security now!
F-Secure: F-Secure Support pages: F-Secure Online Virus Scanner
Norton (Symantec): http://security.symantec.com/ssc/
Audit My Pc: Firewall Test, Web Tools and Free Internet Security Audit
Prevx Free: Prevx Free
Microsoft: http://onecare.live.com/site/pt-pt/d...cid=ideas_wlsc

Online Security Info:
VirusList: Viruslist.com - Information About Viruses, Hackers and Spam
McAfee: Free anti-virus software; Freebyte's Guide to
Symantec: http://www.symantec.com/business/sec...er/threats.jsp
Trend Micro: http://www.trendmicro.com/vinfo/
Trend Micro Malware Map: TrendWatch - Trend Labs

More:
Peerguardian: Phoenix Labs PeerGuardian 2
Web Security Guard: For Better Internet Security, Download Free Web Security Guard
PC Flank: PC Flank: Make sure you're protected on all sides.
Anti-Trojan Shield: Anti-Trojan Shield - High Performance Trojan Detector
HijackThis!: http://www.trendsecure.com/portal/en...ols/hijackthis
a-squared HiJackFree: a-squared Anti-Malware (a2) Download - Free Downloads of the Trial- and Freeware-Versions
a-squared Anti-Dialer: a-squared Anti-Malware (a2) Download - Free Downloads of the Trial- and Freeware-Versions
AnalogX Script Defender: http://www.analogx.com/CONTENTS/down...em/sdefend.htm
VundoFix: http://www.atribune.org/content/view/24/2/
SmitFraudFix: SmitFraudFix
Pc Security Test 2007: PC SECURITY TEST 2007 - antivirus / antispyware / antihacking
Comodo Anti-Malware: Free Firewall Protection Software AntiVirus Buffer Overflow Attack Computer Security Free Personal Firewall
McAfee Stinger: McAfee Threat Center
McAfee Free Services: Antivirus Software and Internet Security For Your PC | McAfee

Malware Removal Tools:
F-Secure: Security threat information from F-Secure Security Center and Lab

Wireless Tools:
AirSnare: AirSnare - Intrusion Detection Software for Windows
iPig: Download iPIG VPN - iOpus Private Internet Gateway - Security in open WIFI, WLAN, LAN networks
LucidLink WiFi Client: LucidLink WiFi Client - Free WiFi Client Download

Online Firewall tests:
Shields UP!: https://www.grc.com/x/ne.dll?bh0bkyd2
Firewall Leak Tester: Firewall Leak Tester
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The above is a good list for freeware software, however these are my recommendations.

AVG Free

AVG free is a good anti-virus tool for people looking for a free alternative to costly software. Recommended for home desktop users.

Link

AdAware

AdAware by lavasoft is a free tool for removing adware and spyware from your computer. Good free tool, very useful and recommended.

Link

Spybot - Search and Destroy

Spybot - S & D is also another good one for spyware and adware. Completely free ware highly recommended.

Link

If you have anything to add please PM me. I'm very aware that there are tons more however those 3 programs should do the trick.