Antivirus & Anti-Spyware
Ad-Aware - (free) removes spyware. Now with antivirus, rootkit protection and more.
AVG (free) antivirus software.
Avira (free) antivirus software.
Microsoft Security Essentials, (free) real-time protection for your home PC that guards against viruses, spyware, and other malicious software. Very easy to use...
Microsoft Windows Defender (free) anti-spyware. It runs locally on your pc. It protects and speeds up your pc and more.
SpyBot Search and Destroy Scans for adware, spyware, and more for free. Download site has an instructional video too!
Sophos for Macs. Antivirus, Trojan detection, download and usb stick protection as well.
Trend Micro HouseCall - free virus / spyware scanner capable of detecting and removing malware, rootkits, trojans and more. Supports Windows XP (SP2), Vista and 7 (both 32 and 64 bit). This is an on-demand application that only runs when you run it... it is not a replacement for your regular antivirus / spyware application.
Note:
Several applications have both Free and paid versions. Get the FREE one!
We recommend that only one firewall or antivirus application be running at a time. (i.e. disable Windows firewall if you install another firewall package.)