PCTools Spyware Doctor rated 95/100 in PCWorld benchmarks and identified as the best Anti-spyware around is here. The Starter Edition comes built-in with all the features of the paid version barring the real-time protection that the latter offers.
Spyware Doctor 6.0  is a top-rated malware & spyware removal utility that detects, removes and protects your PC from thousands of potential spyware, adware, trojans, keyloggers, spybots and tracking threats. It is highly user-friendly as it doesn’t need much of an interaction like other security software around and alerts the user only if necessary. The software’s detection of spyware and malware are unbeatable and it is always one step ahead of the other utilities and virus developers. The starter version features a manual update feature which can be used to update the latest virus definitions and spyware detection techniques. The updates are done almost on a daily basis.
The latest version of the Spyware Doctor 6.0  runs on Windows 2000/ windows XP/ windows Vista operating systems.