My windows 7 installation won't assign a drive letter to disc drives and manually trying in the device manager doesn't work either. This is also the same for virtual and external drives, it doesn't assign a letter for either...
im now receiving this message for my devices
"Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)"