Some customers reported an issue where installing the MediaNow software on a Windows 7 64bit system seemed to disable their CD/DVD-ROM drive. After investigating this issue, we were able to determine that the problem is related to the iTunes bonus program that can be installed at the same time. Apple has an FAQ on their site that provides a solution to this issue:

http://support.apple.com/kb/HT2615

We have confirmed that this solution will resolve the issue with the CD/DVD-ROM drive.