Sys_Keylog Advanced is a tool that will track everything that takes place on our computer, from the applications that are launched, to each of the keystrokes.
The program can be configured to be able to carry out screen captures every certain amount of time, so as to make it send the reports that it generates automatically by email or to be able to hide its presence totally, and that only we will be able to access it.
It isn't specially difficult to handle, but some of its functions require advanced computing knowledge to be able to make the most of them.
Its interface is rather dull, but it isn't a really important factor taking into account the kind of application that we are dealing with.
If you want to know how your PC is used at all times, without anybody knowing that you are keeping track, try Sys_Keylog Advanced.