You can use DWG Repair Toolbox to repair and save your drawing file. In the meantime you'll have to figure out what is causing your program to crash.
Tool can be tested from: http://www.autocad.repairtoolbox.com/
Moreover, utilize next method:
Try using RECOVER, or INSERT it into a blank drawing. Is there an autosave SV$ file available? search your system for *.sv$; you may be lucky and find one.
At the top of the DG Jessica put together a pretty exhaustive list of things that could be useful. you might want to give it a perusal
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