WinPatrol

This handy program alert you to hijackings, malware attacks and critical changes made to your computer without your permission.
It keeps tabs on programs running on your PC (including the hidden ones) and alerting you if a program tries to install something unexpected, sets itself to run on startup, change your home page or install something it shouldn't. You can delete the offending programs, block their automatic startup or just monitor them to see what they do.

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 of your critical system resources and alerts you to any changes that may occur without your knowledge.

WinPatrol Homepage