Ran accross this unusual problem.
I can open an excel spreadsheet, but should I close it and try to re-open
it, it will hang the excel program. there is no error messages, and I have
to reboot to get excel to work.

I have uninstalled and reinstalled excel 2003. but still the same problem.
I can open the files many times on other PC's.

any idea what might be causing this?