Your PC keeps records of both your online and off-line activity. Any of the Web Pages, Movies, Pictures, Sounds, E-mail and Everything Else you have ever viewed could easily be recovered – even after many years passed! This is a serious threat to the legitimate user’s privacy. Activity and Authentication Analyzer is a solution to this problem. AAAnalyzer is the powerful security software, which has been primarily destined to comprehensive search, analysis, the user activity traces left after work. The activity analysis and authentication or how it is called in brief “statistics”, as the method of information (intelligence data) collection is applied either for the preliminary exploring or when the access to information (posted message, telephone talk) is impossible or unwanted. As applied to the computer security topics the activity analysis and authentication is performed when it is impossible to get documents’ copies, which user worked on, for example, stored either on ciphered or dismounted disk containers. Nevertheless, “nothing is disappeared without any trace” and it is possible, therefore, to disclose much useful data from the documents’ names, Internet addresses, which were visited, the applications’ names which were launched or file names which were searched, last user’s logon name. Windows 95/98/NT/2000/XP/2003/Vista/7/8/8.1/10/11 has the system registry database, which is useful, for the first, to the very OS, but, for the second, for keeping many traces (evidences in other words) left by routine work and for either exploration, or for reconstruction of user’s activity. Its built-in functionality allows to search the traces left in system registry, stored in registry keys related to the activity and authentication analysis