Malware scanners:
Malwarebytes' Anti-Malware: http://malwarebytes.org/
Detects and Removes: Trojans, Spyware, Adware, HiJackers, Worms, Parasites, KeyLoggers, Dialers, Rootkits, Rogue Security Products and more!
SUPERAntiSpyware: http://superantispyware.com/
Detect and Removes: Spyware, Adware and Remove Malware, Trojans, Dialers, Worms, KeyLoggers, HiJackers, Parasites, Rootkits, Rogue Security Products and many other types of threats.
Avira AntiVir Personal: http://www.free-av.com/
Detects and Removes: Trojans, Worms, Viruses, Dialers, Rootkits, Spyware, and Adware.
Avast! Home Edition: http://www.avast.com/
Detects and Removes: Malware, Spyware, Rootkits, and Trojans.
Firewalls:
Comodo Firewall: http://www.comodo.com/
AWESOME! THIS I WOULD RECOMMEND YOU FIRST!
ZoneAlarm Basic Firewall: http://www.zonealarm.com/security/en-us/home.
GOOD! THIS I WOULD RECOMMEND YOU SECOND!