Read the manual.....
I have installed hundreds if not thousands of hikvision cameras with very very few problems. Most people posting here are individuals, Hikvision do not sell cameras to individuals only to disributors You would not ring Ford about you car problems you ring a Ford dealer. Many stupid statements like Hikvision make their cameras to not work out of the box prove the people dont read the manual, as to make them more secure Hikvision cameras do not come with a default password (because people are lazy and do not change it leaving their systems insecure) If you had a system installed you should contact the installer not the manufacturer it is a commercial product.