I have a part number in row a, and I want to look up the part # on an
inventory list in a separate worksheet, and have excel return the total
number of that part # in stock.
Right now I have:

=SUMPRODUCT(--('c:\Database\[FINISHED GOODS.XLS]Finished
Goods'!$A$2:$A$260=A85),'c:\Database\[FINISHED GOODS.XLS]Finished
Goods'!$C$2:$C$200)

A85 being the cell that contains the part # to be looked up
C:\Database\[FINISHED GOODS.XLS]Finished Goods'! being the spreadsheet to
lookup on, A2:A200 being the column with the part # in finished goods, and
c2:c200 being the column with the number of units in stock.

It is returning a #value message

I hope I am not confusing you all too much. I really could use some help

Thanks in advance