The problem is when you plug in a thumb drive or external USB hard drive…nothing happens. You hear the USB sound but AutoPlay doesn’t run, and when you look in Computer you don’t see the drive. More than likely Windows named the drive to a letter that is already in use.
To fix the problem right-click on Computer from the Start Menu or Desktop Icon, and select Manage.
In the Computer Management window, under Storage, click on Disk Management to see a list of drives connected to your machine.
You should be able to determine which one is the drive you’re trying to access by its size and