The new USB pen drive installation mechanism on XP machines works with two files stored in the Windows/Inf folder:...
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usbstor.inf and usbstor.pnf.
To disable this function, you must deny access to the "System" built-in user group for the XP machine.
However, on large networks, changing the permissions for these two files on each individual machine is a hassle. However, you can easily incorporate these permissions into your log-on script as shown below:
cd c:\windows\inf echo|y cacls usbstor.inf /p system:n echo|y cacls usbstor.pnf /p system:n
Now any new USB pen drives connected to the PCs will not be automatically installed. To enable access, you will have to change the n's in the script to f's.
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