While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.
So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.
And to be honest you are going to have real problems without 3rd party components as .XLS files are a proprietary binary format, so are going to be a PITA to process without external help. .XLSX files are a little easier because they are ZIP folders containing XLS data files which are at least text based rather than binary, but they aren't going to be easy to work with with batch or Powershell scripts either. C# is your best bet, but ... don't expect that to be trivial stuff either!
If you are having problems getting started at all, then this may help:
How to Write Code to Solve a Problem, A Beginner's Guide[
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