Haunted House?

I have lived in the same house now for 4 years. I bought the house after a lady and her husband died in a car accident. Weird things have been happening though. I don't believe in ghosts, but things will disappear and reappear, noises can be heard when nobody is home, and lights tend to come on by themselves. I have been hesitant to tell people because they might think I'm crazy, but I don't know what else to do. I love this house and don't want to move, but I don't know how to continue living with these mysterious occurences that keep happening. Any suggestions?