[mso] Office Excel 2000 Problem

I have been receiving error messages using Excel 2000, and the error messages 
have been occuring often, if not every time, I try to open certain files.  The 
error message is as follows:
 
The Instruction at "0x303c2986" referenced memory at "0x0000000b".
The memory could not be "read".
Click OK to terminate the program. 
 
Is their any advice that can be given to correct this problem?
 
                
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