Excel Crashes on Close Workbook

The Microsoft Error Reporting window pops up. When "Send"
is selected the recovered document is usully too
corrupted to salvage. When "Don't Send" is selected the
document is sometimes intact or loss of data is minimal.
Can also occur with "Print Preview".

Excel 2003 on XP PRO

My MD has problems at leat twice a week with this and is
tearing his hair out.

XP Pro and Office both fully patched up to date.

MAP Point 2002 when run from Excel also caused program to
crash

Any pointers would be most welcome