Sometimes devices become unresponsive because of various causes. For example, a program might prevent the functionality of the camera or it might access the files that the camera needs. If the driver is installed properly, the simplest way to fix it is by switching the connection port. Attach the cable to another USB port and then start it again and it should work. Sometimes even a simple restart fixes various problems. If that doesn't work, reinstall the driver but remove the currently installed one.
