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I always think that PC Tools products such as Spyware Doctor, ThreatFire, Privacy Guardian and etc has a lot of potential. Their software are low in system resource usage, easy to use and comes in nice graphical user interface. Their most popular product Spyware Doctor which received many many awards has recently gone through a major update from v5.5 to v6. Although the interface for Spyware Doctor v6 with AntiVirus still looks the same as v5.5, but it has a lot of improveme