I can only guess you have some PC and Windows and MS-Excel. Does Open Office from http://www.openoffice.org open it OK?
Are you doing something odd like Excel 97 on Windows XP?
Whenever i open a file MS-Excel hangs and it never opens and cannot even uninstall ms-office. ultimately had to format the PCs. If anyone knows the solution for this problem, please let me know. My email address is email@example.com