Sorry about that - I fixed it.
For those who are running into the same problem, go to Computer Management --> Disk Management and check the status of the drive that is plugged in but Windows 7 is not recognizing. You may notice that is offline with a notice that reads as follows -
"The disk is offline because it has a signature collusion with another disk that is online."
Simply right-click the offline disk and click 'online.' Problem should be solved!