enable/disable USB ports ?

HOW TO BLOCK/UNBLOCK USB PORT??

Read in one of the Article on Microsoft Website which tells you How to Disable Storage Devices.All you need to do is changes in Registry key would disable the device,but before changing any keys in registry read this note
“Warning : Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. If a USB storage device is already installed on the computer”

FOR ENABLING

1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate and then click the following registry key:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesUsbStor
4. In the details pane, double-click Start.
5. In the Value data box, type 4, click Hexadecimal (if it is not already selected), and then click OK.
6. Exit Registry Editor.

FOR DISABLING

1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesUsbStor
4. In the right pane, double-click Start.
5. In the Value data box, type 3, click Hexadecimal (if it is not already selected), and then click OK.
6. Quit Registry Editor.