I hooked up my new Droid Razr HD running 4.1.2 to my computer running W7 Enterprise and it registered as a CD drive E: containing 32 MB and no free space, containing the MDM drivers, setup, and autorun files. I got the popup asking to install the MDM, and clicked on that, and closed all other running applications. Seemed to install, but the drive listings in Explorer did not change to show a mass storage drive. Phone does have Settings-USB Storage-MTP checked. I uninstalled MDM, went to the Motorola website and downloaded the latest version of MDM. Installed, same result. Tried running Microsoft FixIt to see if there was a registry problem, so CD E: MDM was taken out of the listings in Explorer. Reinstalled MDM from the Motorola website. Same result, except now if I click on MDM setup in Explorer, nothing happens. I want to transfer files from my computer - pictures, mp3's, files, etc - from my former Blackberry that were saved to my computer.