How to count cells that meet multiple criteria, leaving out duplicates

I am using the following formula to populate cell D2 in Excel 2007:

=SUMPRODUCT(($A$103:$A$65536=$A2)*($B$103:$B$65536>0))

If column A rows 103 thru 65536 matches the heading in A2 AND there is a name populating in column B then I want the cell counted. The issue I am running into is that there are duplicate names in column B. I only want to count a name once if it duplicates (or triplicates for that matter). This formula is repeated several times over multiple worksheets. I say this because macros is very tedious to capture a formula like this where it will have to populate over 500 diffent cells over 6 worksheets. Also, this is one of 8 different formulas that feed into yet another spreadsheet. Is there any assistance that you could offer to hone the criteria.

Any and all assistance is appreciated.