That's so annoying when it happens! From your screenshot I would say drivers are correctly installed, but you could always go to Device Manager and uninstall/reinstall drivers just to make sure. It's strange that it doesn't let you change drive's letter and path (greyed out on your right click menu), because from my experience it's often a problem with the assigned letter; have you tried deleting the volume and making a new one? That way it should let you set a letter of your choosing, so I would definitely start from there. If that doesn't work, I would definitely go with the good old CMD diskpart method to assign a new letter, never failed me once! Go to start and type Command Prompt, you should find the app and then right click on it and *run it as administrator*. When it opens, type: diskpart (and hit enter) then type: list volume (and hit enter) and you should see a list of your disks (should be two, your main internal disk (should be number 0) and your external disk (number 1) so you type: select volume 1 (enter) and finally you type: assign letter=f (enter) assuming you want to use the letter f, but you can choose anything you want aside from the one used by your primary disk (C), maybe try something high in the alphabet to avoid problems. Hope it helps!!  
Dear Sir/Madam,   I would like to enquire for a solution to fixing an issue while connecting an external 1TB 3.0" HDD within an SATA 2.5" HDD enclosure via an USB cable. The problem is that I simply cannot open the HDD on Windows Explorer, while the PC has detected that the external HDD is connected. I viewed the status of the HDD via Disk Management, and it shows the following:   [IMAGE][IMAGE] My only intention is for this 1TB external HDD to be accessible, so with your kind assistance, can you please help me resolve this issue? The community's kind assistance is highly appreciated. With my kind regards, S_Mni2LliP_11 
External HDD Detected, But Not Opening