Nikon D40 question

[HollyS]

Ok, I don't pretend to know anything much about cameras....and yet I kind of have a complicated camera. So here's my question....all of the sudden, no matter what dial setting I use, when I attempt to take a picture, the shutter closes for a good 2-3 seconds and I end up with a blurry picture. What the heck have I done???? I think I just must have changed some settings by accident. I'm hoping that I could just simply push some kind of reset option to put all the settings back to factory (plan to get the book out to for the reset option) because I really didn't change much so I'm not concerned losing them.