Hi Peruvianpisco and
The problem with keyloggers is that they are intended to be undectable to anyone using the PC who hasnt installed it.
the only program that I have any personal experience of is Winspy.
When installed it doesnt show in the list of programs in add/remove, nor does it show it as running on the PC but presumably it will show up in the registry somewhere but as you are probably aware, it could take you a long time to look through all of the registry and the names may not be obvious
The default access for Winspy is SHIFT + F12 but this can be changed once installed in the preferences section.
Maybe you could try various key combinations when the pc is running and see if the log on box appears for whichever keylogger program is installed, that way at least you could identify which program is being used.
Whether that would help you or not, unless you could find the username and password of whoever has installed it, I am unsure :doggie:
My spanish is almost non existant but does your name mean "A Peruvian fisherman" by any chance