A complementary product to antivirus software and desktop firewalls on MS Windows computers. Antivirus software specializes in detecting classic viruses. Many available products have weaknesses in detecting other malicious software (Malware) like Trojans, Dialers, Worms and Spyware (Adware). a-squared fills the gap that malware writers exploit.

This program can detect and remove adware files and modules from your computer such as, Stardialer, Datingbox.nl and Casinopalazzo. Spybot effectively detects spyware, adware, key loggers, Internet dialers, browser hijackers, and some trojan horse programs.
Adaware
Ad-aware SE Personal Edition is the latest version of Lavasoft's popular free antispyware program, and not surprisingly, it continues to meet the high standards that Ad-aware is known for. Long considered the grandfather of antispyware programs, Ad-aware keeps getting better and is one of the recommended additions to any desktop.
Zone Alarm
ZoneAlarm is a firewall that blocks unauthorized access to your computer from other users on the internet. This software is free to download. It is essential to have a firewall on your system.
Belarc Advisor
The Belarc Advisor scans your PC and builds a detailed profile of your installed software and hardware in the form of an HTML report that you can view in your browser. The information includes Local Drive Volumes, memory Modules, printer information, Installed Licenses, Installed software, Multimedia information and a lot more. The report can be save for later or re-generated as needed.
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CCleaner
is a freeware system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware!
Keep your PC bug free
AVG
free anti virus protection
Avast Antivirus
Antivirus software

WinPatrol
Will sniff out Worms, Adware, Spyware, Cookies, Trojan horses and other
virus type, malicious, nasty "mysteryware" that may attack your computer.
Spywareblaster
Helps prevent spyware getting on your pc in the first place.
HijackThis
Prevents Homepage hijacking
Zonealarm
Software firewall, trial version of Pro followed by cut down free version

Kerio Personal Firewall

Firewall

Startup Monitor
Tiny program. Monitors when programs try to set themselves to run at startup
and asks you if you wish to grant them permission. Can stop nasties.