Hate to Share computer with people

I have found few movies to download just now. I saved the movies link in email and planning to download the movie in office. I am trying to save the electrical charges at home. So that I do not have to on the computer 24 hours just to download the movie. I could use office computer to download without off the PC.

The only thing I do not like is my boss’s son will go to the office after I back home. He will on my computer to list music and spoilt my downloading process. Sometime I wish that he wouldn’t come to the office and share my computer. I just do not like someone touch my computer without inform me especially when I have personal thing to do at that time.