NEED HELP WITH DVD DRIVE (D:)

i have had my computer windows XP for nearly three years now and most of that time i have not been able to play cd’s or dvd’s in DVD DRIVE (D:). when i put the disc in it just makes a loading noise but nothing comes up. when i try to click on dvd drive it says please enter disc when theres already one in there. I have tried troubleshooting but cannot find any help on how to get it working again. do you know what could be wrong or how to fix the problem? i have to watch or play discs in the dvd drive (E:) but that wont play no sound of dvd’s no more. please could you help.