Yeah, umm... LOTS more information needed. Please post back and be much more detailed in your explanation of your problem.
Imagine your computer is a car -- you wouldn't walk into a car repair shop and simply say, "My car doesn't work -- fix it." You would say, "I own a 2006 Toyota Camry with a V6 engine and four-wheel drive option. The other day, I ran through a puddle of water and it splashed up into the engine and the engine stopped. I pulled off to the side of the road, let the car sit for 5 minutes, then started it up again and drove off, avoiding all other puddles on the way home. What causes my car's engine to cut off when water splashes into it, and how much will it cost me to fix it?"
We need that kind of explanation of your problem in order to help you.