This old drive was just a secondary drive?
If so, then yes....just change the drive letter to D.
If it was the OS drive, you have bigger issues.
Yep, you (and me I guess) were right. I temporarily renamed the old D: drive to a new letter and renamed my new drive to drive D: and shut down, unplugged the old drive, and started up. Everything seems to be in order now. Thanks for the quick reply.