These restrictions apply to the Add/Remove Programs feature of Control Panel. They allow you to entirely or individually disable components.

To change this, follow the next steps:

1. Open the Registry Editor click on the Start button on your taskbar, then click on Run and type "regedit" and click on OK to start the regedit utility.
    
2. Expand HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer (see picture 1).
   
   

   Picture 1

3. Create a new DWORD value "NoDrives".
    
4. The "NoDrives" value uses a 32-bit word to define local and network drive visibility for each logical drive in the computer. The lower 26 bits of the 32-bit word correspond to drive letters A through Z. Drives are visible when set to 0 and hidden when set to 1.
   
   If your not happy working in Hex, add these decimal numbers to hide the drive(s):
   
   A: 1, B: 2, C: 4, D: 8, E: 16, F: 32, G: 64, H: 128, I: 256, J: 512, K: 1024, L: 2048, M: 4096, N: 8192, O: 16384, P: 32768, Q: 65536, R: 131072, S: 262144, T: 524288, U: 1048576, V: 2097152, W: 4194304, X: 8388608, Y: 16777216, Z: 33554432, ALL: 67108863
   
   For example to hide drive A and drive D, you would add 1 (A) + 8 (D) which means the value should be set to "9".
   
   To disable all the drives set the value to "67108863".
    
5. The modifications you made will be in effect after you reboot your PC.