When I tried that, it told me "only root can do that". So I tried the line again, this time with "sudo" in front of it. Sure enough, it asked for my password, which I entered and then gave me the message: "mount: mount point mnt/cdrom0 does not exist". Oh well.
I think I'm just going to reinstall Windows (it was meant to be dual boot to begin with, but something stuffed up). At least the CD drive works in Windows. But I haven't given up on Linux entirely, it's just something for another place, another time.
Thank you for all your effort, and once I've spread it round some, you WILL recieve +rep.
Pointy_Stick