How do I know what's wrong with power windows not working how do I diagnose the problem and how do I remove door panel

if none of windows are working,check for blown fuse(s) first.do you have a test light?

Since we cannot diagnose your car over the internet, phone or any other means than actually putting our hands on it and testing it, I would recommend you choose a Repair Pal Certified shop and have your car professionally diagnosed and repaired. As for telling you how to diagnose and repair something on your car - Sorry, No. We are professional repair shops, this is how we earn our living and have invested considerably in education, tools, equipment and so forth, this knowledge is not free.