I've been in search of a keylogger that, even during its trial period, is undetectable by task manager, that is, when it's running, you can't see the process in task manager. I've downloaded a bunch of them and the one that finally works is refog keylogger but the big problem with it is that it doesn't start on windows startup. So, is there a keylogger or any spy software that, when running, does not show in task manager. The ones I've downloaded and tried are: Spytech, om spy, real pc spy, and spyrix.
Too long for a comment:
Leaving aside any legal, (which depends on the jurisdiction of the parties involved) and moral issues as to why you need this you can purchase hardware key loggers which physically interpose between the keyboard and the computer and are undetectable by task manager.
It is also worth remembering that any such software, or hardware, solution may not only be reporting to you - if it is installed on a network connected computer then keystrokes could be being sent anywhere in the world.