Please help...

I am using access to gather information. Such as.. I need patient's with a
zero balance on there account. I have a used a query to return this
information however I have duplciates for every entry where the patient has a
zero balance they are appearing more than once. I have changed it to show
only unique in the properties and it shortend the results from 317,984 to
95949. But there are still duplicates. What am I doing wrong???

TIA for all your help!!!