Is there any way that I can still register my iPhone 4 with iTunes if i accedently pressed "never register" ?

When i connected my iPhone to iTunes i accidently pressed the "never register" option that you are given along with the "register later" and "continue" options. When i tried to close and restart my computer and tried to reconnect my iPhone after plugging it in to my computers usb port again . it did not give me the option to register anymore.