I would do the following

SELECT tblShopper.shopperID
FROM tblShopper
WHERE shopperID NOT IN (SELECT DISTINCT tblOrder.shopperid FROM tblorder)

Not sure what DB your using but using a NOT and or a DISTINCT can slow performance. 
Also your distinct appeared to be in the wrong place, I am guessing the 
tblShopper.shopperid is unique so a DISTINCT there will not help you, however using it 
in the subquery makes sense since a sopper could have multiple orders. Truthfully 
though you could eliminate it from the subquery as well.
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