I made this list for another site, but decided it might help people here to. This is a comprehensive list of numerous anti-spyware programs. And firewalls
Anti-Spyware/Virus Programs
Ad-Aware Antispyware (Free) - http://www.lavasoftusa.com/software/adaware/
Aluria security Suite ($) - http://www.aluriasoftware.com/
Spybot search and destroy (Free) - http://www.safer-networking.org/
Microsoft Anti Spyware (Free) - http://www.microsoft.com/athome/security/spyware/software/default.mspx
HiJackThis (Free, use with care) - http://www.spywareinfo.com/~merijn/
Norton Anti Virus ($) - http://www.symantec.com/index.htm
AVG Free Anti Virus (Free) - http://free.grisoft.com/doc/1
Pocket Killbox – (Free) - http://bleepingcomputer.com/files/spyware/KillBox.zip
CounterSpy (Free) – http://www.download.com/CounterSpy/...tml?tag=lst-0-1
Ewido (Trial) – http://www.download.com/Ewido-Secur...tml?tag=lst-0-1
Stinger (Free) – http://www.download.com/Stinger/300...tml?tag=lst-0-1
TrojanHunter (Free) - http://trojanhunter.com/
Trojan Remover (Free) - http://www.simplysup.com/
Spyware Blaster (Trial) - http://www.javacoolsoftware.com/downloads.html
CWShredder (Free) - http://www.intermute.com/spysubtract/cwshredder_download.html
Webroot Spy Sweeper (Trial) - http://netscape.com.com/Webroot-Spy-Sweeper/3000-8022_4-10405877.html?part=netscape
Spyware Doctor (Trial) - http://netscape.com.com/Spyware-Doctor/3000-8022_4-10377263.html
PC Tools AntiVirus (Trial) - http://www.pctools.com/anti-virus/?ref=d77
McAfe AntiSpyware 2 (Trial) - http://www.download.com/McAfee-AntiSpyware/3000-8022_4-10447535.html
Bazooka (Free) - http://www.download.com/Bazooka-Adware-and-Spyware-Scanner/3000-8022_4-10377953.html?tag=lst-0-6
eTrust Pest Control (Trial) - http://www.download.com/eTrust-PestPatrol-Anti-Spyware/3000-8022_4-10345714.html?tag=lst-0-7
Free Online Scans
http://www.kaspersky.com/scanforvirus.html
http://housecall.trendmicro.com/
http://us.mcafee.com/root/mfs/default.asp?cid=9914
http://www.ravantivirus.com/scan/
http://www.bitdefender.com/scan/licence.php
FireWalls
Zone Alarm (Free) - http://www.download.com/ZoneAlarm-Internet-Security-Suite/3000-10435_4-10465074.html
Tiny Personal Firewall (Trial) - http://www.download.com/Tiny-Personal-Firewall/3000-10435_4-10395730.html?tag=lst-0-5
McAfee Personal FireWall (Trial) - http://www.download.com/Tiny-Personal-Firewall/3000-10435_4-10395730.html?tag=lst-0-5
Norton Personal Firewall (Trial) - http://www.download.com/Norton-Personal-Firewall/3000-10435_4-10321116.html?tag=lst-0-6
Sunbelt Kerio Personal Firewall (Trial) - http://www.download.com/Sunbelt-Kerio-Personal-Firewall/3000-10435_4-10487068.html?tag=lst-0-8
Webroot Desktop Firewall (Trial) - http://www.download.com/Webroot-Desktop-Firewall/3000-10435_4-10403676.html?tag=lst-0-9
To be updated
I know some of these are already in the sticky above, this does add a fair amount.
-T