I am the person that will be helping you today. As you are finding out, there is really no way to maintain the Excel files so that they look the same all the time on different computers.
One way to fix this is to convert the Excel document to a PDF file, which you can then give to the customer.
You can install CutePDF Writer, which will allow you to 'print' to PDF from any application.
You can find the application at the following site: http://www.cutepdf.com/Products/CutePDF/writer.asp
You will want to click the "Free Download" link and the "Free Converter" link. Download both of those files and run them.
After that is installed, you can print to pdf. From within any application, click File > Print. In the window that comes up change the "printer" to "CutePDF" writer and click Print. It will ask you where to save the pdf to and then save it. Now you can send those new PDF files out.
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