Almost-Zero information = Almost-Zero answer
A link with many ideas about computer setup http://forums.adobe.com/thread/436215?tstart=0
Work through all of the steps (ideas) listed at http://ppro.wikia.com/wiki/Troubleshooting
If your problem isn't fixed after you follow all of the steps, report back with the DETAILS asked for in the questions at the end of the troubleshooting link
Welcome to the forum.
While gathering the necessary info, this ARTICLE might help you find out what is happening just before and during the crash.
This ARTICLE will give you tips on setting up your computer for an editing session.
This ARTICLE will tell you the types of info that can be so very useful, and necessary for us to help diagnose from our computers.
PS - just click on the words "ARTICLE," and you will be linked to those.