colleague that gets on your nerve!!

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I am so very upset today to one of my colleague. I am working in an education institution as the academic administrative assistant. One of my job is to assist the lecturer. Now, today, one of the lecturers gets on my nerve by touching my computer!! He did ask me earlier in the day to print something and i ok-ed it. Then, i went to my manager's office to ask her about something. But before i can start, a girl from marketing told her something first, so naturally i wait. But it was longer than i expected and then a boy from the marketing who also came to my manager's office told me that he saw this lecturer on my desk. I hurriedly went out from the room the get to mine. Yes, he was there, printing something. I immediately told him that, "you have no right to touch my computer" And he just got this silly grin. I continued with, "do you like it if i touch your computer and browse through?" In which he replied with a soft, "well, no..." I even go to stressed on the fact that "it's not like i'm in Timbuktu!! I'm there, you can see me!!" Yes, it's not like the computer assigned for me at work contains secret information or whatever. It's just that I feel like my privacy has been violated!! And now i dont know how to act in front of him when i see him again since i'm too upset. Now, what about you mylotter? Have you any experience in which your colleague just get on your nerve? And if you have, how do you handle it? And most importantly how do you face them afterward? Thank you!!