I've not seen an answer that hits my issue on the head. I've got one computer out of 60 that will not map one network drive. It actually maps but never shows up in Windows Explorer. I can Y: in the run box and get to the network resource. Reboot doesn't help. I've used usbdeview tool to see if some usb device had taken the drive letter and was causing conflict - nope. I logged into computer as a different user and the same issue persists. Maps but not visible in explorer. I've even plugged a usd drive into the computer, picked the same letter that will not map, and the usb drive will not show up too. Seems like one letter will not map on this one computer.