Ah OK i did think it was some laptop you had with multiple drives lol
So with one HD-DVD drive installed it shows a CD-Drive icon and an HD-DVD drive icon in My Computer and has always done that. How strange but anyway........
Go to this link and download the driver software for your HD-DVD drive:
HP United States - Computers, Laptops, Servers, Printers and more but dont install it yet. Next make sure theres nothing in the HD-DVD drive and reboot your laptop then do this:
1- Click the vista start orb and type
Device Manager and hit enter
2-You'll see
DVD/CD Rom drives click on it to expand it
3- Right click on your drive that shows up and click on
Uninstall
4- After it uninstalls,reboot your laptop and let Windows detect the new hardware and install a new driver for you.
5- Once that driver is installed reboot your laptop again and then try a cd in the drive.
6- If that doesnt work then install the driver you downloaded and reboot your laptop then try a cd.
P.S im sorry this has happened, i use my guide on vista on every pc i install vista on and have never encountered this problem. But i will try to fix what has happened