If a reinstall of AutoCAD doesn't fix it, please post your code.
My experience on this error is that it is a version mismatch (mis-register) of a DLL file.
An idea that I used alot is to get the utility FileMon from SysInternals (Its a File Access Monitor for windows). Make it run, and try to identity to file accessed at the specific time of the crash (you can detect the crash by looking at when the Autodesk recovery thingy fires up, witch you can see in the Monitor). When you have identified the problem (or most probable one, you can't realy do better), then try to unregister it, then reregister it (regsvr32 PathAndNameOfTheFile /u; regsvr32 PathAndNameOfTheFile).
This fixed a few of my "access violation problems", but not all of them.
Hope it works.
