Hey everyone, OP here :) Thanks for the funny comments, it IS a weird situation, you have no idea what it's like to try to convince the HR lady that "**** site were appearing on my desktop and I have no idea who is doing it or how it's being done" :P Let me clear a few things up (since the debates were polarized around change your password / install nanny cam / take laptop home): 1- Our login passwords are company issued and the IT change them every 6 months. If I want to change it I have to submit a formal request to the HR department, and since the lady didn't believe me back then, it wasn't an option to change it. 2- I did think about the nanny cam and wanted to get one so i could catch the culprit but the situation was solved before i had a chance to do that. 3- About taking the laptop home, not an option since they are extremely stingy and attached to their stuff (we actually have to send a friggin' email if we want pens or paper...) so they would have had that "HOW DARE SHE" look if i had suggested it :P Turns out the HR department got another complaint of the same nature from an employee from another floor, and since there were now two complaints they decided to investigate, and lo and behold, the most typical of twists... IT WAS THE JANITOOOOR They haven't said much yet, like about how he got the passwords (i'm guessing mopping behind us while we log in or something, we never really thought to notice if he was looking) and obviously he had keys. Still don't know why he picked our laptops, or why he didn't just look for **** elsewhere :/ or why he didn't just close the windows when he's done or whatever... Hopefully we'll find out more. So there you go :)