[AntiVirus/Spam/Malware/Etc] Freeware programs & tools

MS Security Essentials:



Use Microsoft Security Essentials to guard against viruses, spyware, and other evil software. It provides real-time protection for your home or small business PCs.
Microsoft Security Essentials is free* and we designed it to be simple to install and easy to use. It runs quietly and efficiently in the background so you don't have to worry about interruptions or making updates.

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Malwarebytes



Malwarebytes Anti-Malware is a surprisingly effective anti-malware tool given that it hasn't received any major updates in the past few years. Sure, the scans are a bit faster and the installation is definitely smoother, but overall the product remains unaltered.

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CC CLeaner



Freeware system optimization and privacy tool that erases Internet history and other unused files, and cleans up orphaned registry entries.





Anti-rootkit utility TDSSKiller:



TDSSKiller is a free anti-rootkit utility, developed by Kaspersky that allows removing malware family Rootkit.Win32.TDSS, as well as other ROOT KITS.





Comodo Cleaning Essentials:



Comodo Cleaning Essentials (CCE) is a set of computer security tools designed to help users identify and remove malware and unsafe processes from infected computers.





Virustotal:



VirusTotal is a free virus, malware and URL online scanning service. File checking is done with more than 40 antivirus solutions.