Sandboxie – Creates a virtual environment (sandbox) for safe surfing. Browse the web from within a "sandbox". When you delete the contents of the sandbox everything, including spyware and malware, is erased. A great way to protect yourself on the web. (XP/Vista 32bit)
WinPatrol – Versatile startup manager which prevents software from adding itself to the startup process without your knowledge/permission. Having too many programs starting up with Windows can slow things down considerably, some are needed many are not. keep them all ‘under’ control’ with this very good free app. (XP/Vista 32/64bit)
Hijack This – Creates a log file of the contents of key areas of the Registry and hard drive, areas that are used by both legitimate programmers and hijackers. This program is continually updated to detect and remove new hijacks. A serious tool for any user who needs to root out a serious infestation. Note: Use with caution, experience is essential when interpreting the results. If unsure, confer with an expert before proceeding with any deletions. (XP/Vista 32/64bit)
Secunia PSI (V1.0) – Secunia Personal Software Inspector is a small application which scans the host computer for outdated and possibly vulnerable software. PSI compares versions installed on the host computer to a comprehensive list of latest versions contained in its huge data base. At scans end a list of outdated/insecure applications is generated, including links to the latest versions and or updates. Secunia PSI is a must have for anyone serious about keeping 3rd party applications up to date and maintaining a secure computing environment. (XP/Vista 32/64bit)