You can check with Computer Management to see if a drive letter is being assigned to the drive.
If the drive doesn't show in computer management with or without a drive letter, there maybe a problem with the USB hub drivers. You can check for problems with the drivers through device management.
If the drive is showing in computer management and you have no success assigning a drive letter, you may need to reformat the drive after you have copied all your data with a different OS. I know this sounds strange but I have had a drive that windows 7 would not recognize until after I formated.