Free Tools for Fighting With Malware

Try this software's to detect any kind of malware in your system.

Anti-Virus:
Avira AntiVir PersonalEdition Classic
AVG Anti-Virus Free
Free avast! 4 Home Edition

OnLine Anti-Virus:
Trend Micro
Panda Software
F-Secure
ESET

Anti-Malware:

Malwarebytes' Anti-Malware
Dr.Web CureIt

OnLine Trojan Scan:
TrojanScan

Spyware/Adware Tools:
Spybot S & D
IE-SPYAD
MVPS HOSTS File
SpywareBlaster
HijackThis

Firewall:
Sunbelt Personal Firewall
ZoneAlarm firewall
Agnitum Outpost Free

Tutorials:
How did I get Infected?
Internet Explorer Privacy & Security Settings