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On start up Mathematica warns you of a "serious error" and advises you to quit.


Don't choose quit, instead dismiss the warning. The next screen will tell you the name of a file that has been corrupted. Quite possibly the file will be:


Whatever the file is called, locate it, rename it and then restart Mathematica


You may have exceeded your disk quota at the time that Mathematica was writing to that file (resulting in a corrupted file).