My hard drives have disappeared from Disk Management. Not sure when. Only the DVD drive remains in the list. Drives are still visible in Windows Explorer. Drives work normally. Disk Management >> http://i494.photobucket.com/albums/rr303/lyleisaacs/HardDrive.jpg Windows Explorer >> http://i494.photobucket.com/albums/rr303/lyleisaacs/Explorer.jpg Computer is set up as dual-boot Windows 7 32bit and Windows 7 64bit on separate partitions. Only the 32bit version has this problem. I signed in as another user (Admin) and result was the same.