Step 1. Open Registry Editor. Click Start -> Run type regedit in the box and click OK.

Step 2. Navigate to:
[code]HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\
Explorer[/code]

Step 3. From the Menu, navigate to Edit -> New -> DWORD Value

Step 4. Name the New Value NoDrives.

Step 5. Next, Right click NoDrives and select Modify, now check the Decimal option and under Value Data enter a decimal value for the drive you would like to hide. For example to hide C you would enter 4. See the list below for more values:

[list][*]A=1
[*]B=2
[*]C=4
[*]D=8
[*]E=16
[*]F=32
[*]G=64
[*]H=128
[*]I=256[/list]

Step 6. Click OK once finished and restart your PC to verify the drive letter is no longer displayed.

NOTE : You can delete the key that was created to display the drive again.