Hi all, I know this is an old post but since I've yet to see a solution to this problem, I thought I'd share my solution. It seems that on some d620s a dvd rom module is used that cannot be read by the windows 7 installation media. The resolution is to remove the drive while powered off then resume with the installation as normal. Hope this helps anyone still looking for a solution to this headache. ;))
My system is : Latitude D620   While trying to upgrade from win XP win 7, actually not upgrade but clean install, I boot from the Win7 DVD. Everything starts normally, I choose language settings and press "install now".   Then this message appears "a required CD/DVD drive device driver is missing. If you have a driver floppy disk, cd dvd or usb flash drive please insert it now"   I googled, and read hundreds of opinions and experiences regarding this matter, bad dvd burn, IDE controller incompatibility, that you cannot go directly from XP to 7 etc etc   Please advice. Up to now I tried every conventional possible solution, like DVD firmware upgrade, reburn 4 times from different burning software, install from USB flash drive (that produced exactly the same error message).   The win7 version is 32bit ultimate retail.   Thanks in advance   Panos
 "CD/DVD drive device driver is missing" while trying to upgrade from XP to 7