Blender 2.68 Crashing

I drew an object file…it was going o.k.
until recently.

I ran into a strange problem.

Blender can open the file, and I can draw, edit, as normal.
I can also save as a Blender file.

The program crashes when I hit TAB to exit from EDIT mode to Object mode.

The program also crashes when I try to export the file.

So I can’t export it or go into Object Mode without crashing.

I can open other files and it doesn’t crash, so I guess my file
is corrupted?..

I am hoping I can save the file, took awhile to draw.

weird.

Blender 2.68
Windows 7 Professional 32 Bit.