Linux laptop to monitor a windows box

Hi, i work at a library with at the moment one shared computer up and going. some new ones are ordered. I have a problem with people entering restricted web pages, installing stuff and nearly killing the pc. so i wondered if some of you could recommend a software for monitoring from my linux laptop. software monitoring things like web pages visited, apps launched, and stuff like that? i would prefer if the software was not to easy to be discovered since some of the teenagers using the computer have some knowledge.

Regards Maria