I have a Gateway All-in-One Model ZX4270 which I have upgraded from Windows 8.1 to 10. All is OK except that I apparently lost my CD/DVD drive in the process. It is still physically there, and it spins a disk when one is inserted, but the computer doesn't recognize the drive. It isn't shown on File Explorer. Based on advice from the Microsoft forum, I first ran the Troubleshooter (no effect) and then uninstalled the driver from the Device Manager and rebooted, but no new driver was installed. I've looked on the Acer web site for a new driver to download, but none seems to be listed. Any help or ideas would be appreciated.