Filter Spreadsheets Simple Application

I need a simple application building that I can remove duplicates from a excel spreadsheet. I have 3 spreadsheets one is a master spreadsheet contains a list of addresses, I have a further 2 spreadsheets that the master spreadsheet needs comparing with. The master spreadsheet will need the duplicated removing. The system will check the Address and Post code in order to remove the duplicates. I would like a simple to use application where I browse for the spreadsheets and load them into the application which will then automatically remove the duplicate addresses. A duplicate is classed as an record that matches the address and the post code. I will need to handle around 10,000 records for processing at a time. Thanks Matthew