Just had a quick check to see if anyone else was having a similar problem and would you believe it
Try these steps:
Open Command Prompt. (CMD)
Type: diskpart
At the DISKPART prompt, type: list volume
Make note of the number of the simple volume whose drive letter you want to assign, change, or remove.
At the DISKPART prompt, type: select volume n
Select the volume, where n is the volume's number, whose drive letter you want to assign, change, or remove.
At the DISKPART prompt, type one of the following: assign letter=L
Where L is the drive letter you want to assign or change.