Totally Useless -- The person who wants to access your PC simply boots to Safe Mode (as noted in other reviews of KeyLock across the internet). Contrary to the comment below by Brabonet, it is noteworthy that (as of the current date) the KeyLock website fails to make even ONE Mention of the phrase "safe mode" -- despite the fact that protection from a Safe-Mode-Boot is Utterly BASIC to a program which, Supposedly, "Locks" a Windows PC! Without Safe Mode support, what in the world good is a program like this ??!