|This may be easier.|
I'd like to know what Device Manager is saying. Upload screenshots if you know how.
Start > Control Panel > System > Hardware > Device Manager
This is how it should look, no red or yellow marks.
Now click on the + alongside the DVD/CD-Rom drives.
Right click on the drive & select Properties.
On the General page ( usually the 1st page to open ), go down to Device status & tell me what it says in the box.