Try UN-installing the drive in Device Manager, then shut pc down and unplug from mains wall plug. Now hold in the Power Button on Tower for 30 seconds to discharge any residual current etc. Wait for at least 3-5 mins and then plug back in and boot up.
The drive should be recognised as 'Found New Hardware' and proceed to install it.
Put a known good CD or DVD in and hopefully it can now be read.