How to Disable USB ports in windows XP

Now You can Disable USB ports in your XP mechine to prevent trojans or spyware 
Just Follow these simple steps
Step :1
Click Start, and then click Run. In the Open box, type regedit and then click OK.

Step:2
click the following registry
HKEY_LOCAL_MACHINESYSTEM/CurrentControlSet/Services/ UsbStor

Step:3
In the details pane, double-click on Start.
In the Value data box, type 4, and tick Hexadecimal 
then click OK.

How to reanable USB ports in windows XP

Step :1

Click Start, and then click Run. In the Open box, type regedit and then click OK.

Step:2

click the following registry

HKEY_LOCAL_MACHINESYSTEM/CurrentControlSet/Services/UsbStor

Step:3

In the details pane, double-click on Start.
In the Value data box, type 3, and tick Hexadecimal 

then click OK.