I need help with my camera!?

It's probably because the camera does not charge via USB. The vast majority of cameras do not do this, instead they use a special charging dock. The EX-Z100 uses the BC-31L charger, to charge the battery. a href="http://www.amazon.co.uk/Casio-BC-30L-BC-31L-Charger-Battery/dp/B00427OEXQ/ref=sr_1_2?s=electronics&ie=UTF8&qid=1309968213&sr=1-2" rel="nofollow"http://www.amazon.co.uk/Casio-BC-30L-BC-…/a