I have a large workbook with 40 or so sheets, each sheet with less than 1000 rows and about 80-100 columns.
A lot of formulas and referencing cell values on other sheets within the workbook, grouping, conditional formating etc.

Excel started to crash yesterday when I was editing some of the formulas. I have since run diagnostics, reinstalled Office 2007 and split the workbook in 2.

Now it is crashing even when I'm editing the smaller workbooks, so I'm not sure if it is related at all to the size. It is also corrupting the file when it crashes.

Error message only says that Excel has encountered a problem and needs to close.

Any ideas on what I can do??