Hi, I have been having difficulties to open my webcam or even capture  a photo,  I don`t have the camera app on my desktop, what  do I do, ,moreover my audio and microphone are not working, have been trying this for the past three months all In vain, I cannot video chat on Skype nor can I voice call, one more thing how d I do to allow access to call and answer call directly that comes through when using a modem,