Hi,
I think it may be that the excel spreadsheet you are trying to load is from a different version of Excel than you have. Try loading it into excel directly, and then save it into a different location, "My documents" for example, and then try to load it from there. If it will not load that way, then you can download Openoffice.org, this is better at loading old excel files than excel is. Load the spreadsheet into ths and then save it as the type of excel which you have.