DVD/CD ROM drive not working?

Okay so my drive is not working wont even notice i put a disk in, i unistalled it like someone told me adn tried to renistall but it said it failed, someone told me to go to company site or something to re install it, how do i find this site or w.e please help me. Acer laptop, windows vista basic, intel celeron, any more info needed please let me know