invalid page fault in module excel.exe

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Having trouble with a shared excel 97 workbook. We use an
html link to the excel file. Recently 1 user began to get
the "invalid page fault in module excel.exe" message
whenever she attempts to open the xcel file. Same problem
whether she tries to access the workbook via the link or
whether she opens excel first and then tries to open the
workbook. Until a few days ago, she had no trouble with
this. She can open other workbooks, but not this
particualr one. All other users can still open and modify
the workbook. What could be causing this problem?

Thanks for your help!