First, on your Windows PC, press Windows + Pause/Break key combination and open Device Manager. Expand the Disc drives list, right-click on the driver and select Uninstall. Reboot your computer, press Scan for hardware changes icon from Device Manager and wait for Windows to retrieve the drivers. If it doesn't help, run the Fix It utility provided by Microsoft. It is developed to identify and repair CD or DVD drive issues, when you cannot play CD or DVD discs. Also, on your Mac try applying the solutions provided on Apple forum. If the discs doesn't work, they might be corrupted and you will need to contact the vendor.