The new laws about IT security impose clear rules in order to guarantee the privacy of information that companies and professionals have in their databases. In Windows 95/98/Me the password can be easely evaded by simply pushing the button ESC at request.This does not involve any malfunction, far from it, it allows everyone to enter the operative system. Blocker was born in order to satisfy these needs and many others for any PC running Windows operative systems. Passwords management; Log of loaded programs; Automatic recovery in case of delation; Password disactivation (DPR319); Customized database for a total security (DPR319); Uninstallation exclusively allowed to the Web Administrator; Access limitation; Block activation during inactivity; Quick lunch buttons for a quick start of the block. Blocker's potentialities may be even increased by joining the ReaderBLK kit which permits a smart card management of the system for a greater security. All functions will be integrated by the user's smart card and as soon as it is taken out of the reader, the system starts the block. Blocker occupies just 80Kb of memory and is completely invisible to the system even the program list in Ctrl+Alt+Del. On the website www.blutronics.com a demo version for 15 days is available.