Finding who was on my computer

Hi I was away for 2 weeks on vacation. When I returned home I couldn't open an of my videos online, they would come up but not play. I had already suspected that someone was in my apartment due to things were missing, out of place and trash left behind. I don't know what I was doing but I pulled up a page with 3 email addresses on them. 2 I recognized right away but I cannot remember the 3rd one. It would be great if you could provide me with the knowledge of either how did I open that page, or get me the 3 emails. I need to confront these individuals. They broke into my apartment when I was away. Please assist me with this task. Your cooperation is greatly appreciated. I am the owner and administrator of this system. Thank you for taking the time out of your busy day to help me. Again, greatly appreciated.