Excel quits when saving Macro spreadsheets
 

I'm am running WinXP SP2 with Office 2003 SP2 all fully updated. My problem
is that whenever I want to save a spreadsheet in Excel with macros, Excel
will close stating that it has encountered an error and must restart. It is
not a problem with a specific spreadsheet because it happens to all
spreadsheets with macros, nor is it a problem with macros being enabled or
disabled. This error does not, however, happen to spreadsheets without
macros.

Misc. info:
Macro security: Medium (Never has caused problems before)
This occurs with multiple accounts.