The simulation tools offered by Autodesk are comprehensive and will allow you to solve many interesting problems. The solutions to some of these problems sometimes take many hours to solve. One of the barriers to reaching a successful conclusion is the tendency for Windows to restart your computer without checking in with you first. For example, NASTRAN In-CAD, Autodesk Simulation Mechanical, Autodesk Moldflow, and Autodesk CFD all keep a great deal of information in volatile memory. When the power is cut, the information is lost and your simulation is lost along with it. To prevent this from happening, you can certainly search the web like I did. A good search term is “how to prevent windows 7 from restarting automatically.” If you don’t have time, or have no idea what the forums are talking about, you can use this guide to help you. This procedure applies to Windows 7 Professional.