Download the most trusted free antivirus and antispyware security software for Windows 7, Vista and Windows XP
Ad-Aware Free Anti-Malware features real-time protection, a rootkit removal system, automatic updates, and much more — to ensure that you have the power to protect yourself online.
Searches whole computer or just a certain file for malicious software commonly missed by anti-virus programs. Can be used to clean usage tracks.
Antivirus 2009 is a new rogue anti-spyware program from the same family as Antivirus 2008 and Doctor Antivirus . Antivirus 2009 is installed and advertised through the use of misleading web sites that attempt to make you think your computer is infected with a variety of malware. Once installed, Antivirus 2009 will scan your computer and list a variety of fake infections that can't be removed unless you first purchase the software. (pdf)
"application and services worth paying for ... but you don't have to"