excel won't open a spreadsheet

I

Im On Break

My Excel 2003 will not open a spreadsheet opened from explorer or the desktop
or email. The program starts but only shows an empty pane. It will open a
document when opened from within the excel file menu though. Lotus notes says
'Unable to Locate Program when I try to open an email attachment, but excel
does open. I've tried to reinstall twice with updates to no avail. Anyone
have any ideas?

Thanks!
 
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