Access Violation or Divide By Zero immediately on startup

This is almost ALWAYS a graphics card driver issue and can usually be resolved by updating your graphics driver which you can do by going to your graphics card manufacturer's site and downloading a more recent driver.  

NOTE: If you are using a notebook, then you should first see if your notebook manufacturer has a graphics card update because graphics cards are modified by Notebook manufacturers and their drivers are optimized for your notebook.

If you lack the technical skills or confidence to do this (though it's really not that hard) first do a google search for updating graphics drivers or try a site like http://www.drivershq.com which will automatically find and install updated drivers for a small fee.