For some reason, you may need to change the letter that Windows 10 has assigned to your CD / DVD / Disk drive.
The process is most likely very similar for Windows 7 and Windows 8/8.1, however I have not checked this.
To change the drive letter:
Go to Computer Management.
In the start menu, search for Computer Management and click on the desktop app.
Click on Disk Management on the left.
Find your Disk reader, it may be called "DVD-ROM" or "CD-ROM". Right click it and select "Change Drive Letter and Paths..."
Click on "Change".
Under "Assign the following drive letter" select the letter your wish to use, and then select "O...