I have the same problem with Windows 64 -- it reads and writes DVD/DL/BR -- but will neither read or write CDroms. It simply whirls and clicks -- repeating about every20 seconds for about a minute. Dell 'took control' and uninstalled the driver
(plus something in the registry) -- then reinstalled. Also they updated the drive BIOs. Still does not work. I borrowed a portable USB DL DVD/CDROM and the same thing happens!!!
I've convinced it's something in the Windows 7 64bit software.