The following are free:
Ad-Aware: anti-spyware version provides you with advanced protection against spyware that secretly attaches and takes control of your computer, resulting in aggressive advertising pop-ups, sluggish computer activity, even identity theft through stolen bank details, passwords, and credit card account numbers. Free updates too.
Avira AntiVir PersonalEdition Classic: reliably protects your private computer against dangerous viruses, worms, Trojans and costly dialers. Can run in real-time mode and updates daily.
BOClean: protects you against a full spectrum of malware, automatically removing these programs from memory, your hard disk and your registry without the need to reboot or drop your internet connection. BOClean safely neutralizes these threats instantly without any risk of damage to your files or computer. Updates are FREE, and the update download and installation process is (or, in the case of network deployment, can be) completely automated.
Exact Audio Copy: Allows you to rip (store) you CDs onto your computer without a loss in sound quality.
SpywareBlaster: SpywareBlaster can help keep your system spyware-free and secure, without interfering with the "good side" of the web. And unlike other programs, SpywareBlaster does not have to remain running in the background. Prevents the installation of ActiveX-based spyware, adware, browser hijackers, dialers, and other potentially unwanted software. Blocks spyware/tracking cookies in Internet Explorer and Mozilla/Firefox. Restricts the actions of potentially unwanted sites in Internet Explorer.
SpywareGuard: provides a real-time protection solution against spyware, Fast Real-Time Scanning engine - catch and block spyware before it is executed (EXE and CAB files supported) with signature-based scanning for known spyware and heuristic/generic detection capabilities to catch new/mutated spyware. Download Protection - prevent spyware from being download in Internet Explorer. Browser Hijacking Protection - stop browser hijacking activity in real-time. SG LiveUpdate - provides an easy updating solution. Small size - with a small size and small definition sizes, download and updates are quick. Report Capabilities - keep a detailed log of all spyware detected
SUPER ©: If you need a simple, yet very efficient tool to convert (encode) or play any Multimedia file, without reading manuals or spending long hours training, then SUPER © is all you need. It is a Multimedia Encoder and a Multimedia Player, easy-to-use with 1 simple click.
WinPatrol: uses a heuristic behavioral approach to detecting attacks and violations of your computing environment. Traditional security programs scan your hard drive searching for previously identified threats. WinPatrol takes snapshot (real-time) of your critical system resources and alerts you to any changes that may occur without your knowledge. You'll be removing dangerous new programs while others prepare to update their definition/signiture data files.