I am going crazy with this one. When I open an Excel 2000 file in my Windows XP (sp2) Excel 2003 I get the following. "Microsoft Office Excel has encountered a problem and needs to close. We are sorry for the inconvenience" which then generally butchers the file (sometimes does almost ok in trying to "repair" it). I have tried this on two separate computers with Excel 2003 - same results. NOTE: Excel 2000 opens it perfectly on third pc.