If you really want anyone to give you a good protection spell you should explain more to us about what you want us to give you, exactly as wanted.
Saying that you want a powerful protection spell does not give us a chance to think about what to give you or offer to you. I think you should tell what kind of protection spell you want. There are plenty of protection spells, many kinds: House protection, self protection, pet protection, protection from negative powers, magical beings, etc.
You should not even post a forum thread without telling us this kind of information. You should have even told us the situation you are in so we can understand you and help you as well as we can.