If Excel Autocomplete is not working, you have to check that Autocomplete is not disabled and that there are no Blank cells in the dataset.

How to Use Auto Complete in a Combo Box in Excel 2003. Excel offers tools and characteristics that make it an ideal platform for you to create data entry forms. One such feature is form controls ...

I'm passingly familiar with autocomplete but have no idea what the 'autocomplete menu' is. Can you provide a screenshot or describe how you invoke it? I'm passingly familiar with autocomplete but ...