My computer is acting up ahhhhhh

Well it's lasted almost 2 month of the school year and now it's acting up. I couldn't connect to the internet this morning when I woke up so I shut it down and when I got back from class I turned it on and it opened to a desktop that I haven't had up since the first 2 weeks of school. Odd and so not good. I shut it down and it's alright for now I think. But it's worrying me. Oh well on to more homework.