First of all, DON'T PANIC! It's easy to do when all of a sudden your computer just goes crazy or shuts down. But, take a deep breath so that you can follow the next very important step: Reboot your computer.
I know it sounds simple, but many end users forget to just take a moment to reboot the computer. This one step can fix a multitude of problems. And, the good news is that your software probably automatically saved at least a portion of what you've been working on, if not the full thing.
So remember, remain calm and reboot your computer. If you are still experiencing problems, then call your computer consulting firm, explain what happened, and that you've already tried rebooting. To learn more about troubleshooting simple computer problems, read the entire article (link above).
Posted by Computer Consulting 101 Professional Kit