There is a property for the combobox called DropDownStyle. There are three options for it:
(From Help Files)
DropDown - The text portion is editable. The user must click the arrow button to display the list portion. This is the default style.
DropDownList - The user cannot directly edit the text portion. The user must click the arrow button to display the list portion. The list displays only if AutoCompleteMode is Suggest or SuggestAppend.
Simple - The text portion is editable. The list portion is always visible.
Set the DropDownStyle for the combo box to DropDownList. And Make sure you have the AutoCompleteMode set as mentioned above.
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Robert L. Johnson III
CCNA, CCDA, MCSA, CNA, Net+, A+, CHDP
VB/Access Programmer