Make sure that your DVD/CD Drive is properly connected with the mainboard. If that doesn't solve it, download the drivers from the mainboard manufacturer's website (If the computer has the network card's driver installed - if that's the cause download the drivers from another computer).
I recommend downloading the drivers from the manufacturer's website, to ensure that you have the latest drivers installed instead of outdated ones, which may hinder the computer's performance and/or cause issues.
Avoid installing drivers from Windows Update.