Lock your USB port

To do this you have to make a registry tweak that will prevent writting to the usb port in Windows XP.
1) Go to 'Start|Run' and type 'Regedit'.
2) Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control.
3) Here add a new folder on the left pane by right clicking on it and selecting 'New|Key'.
4) Name this folder 'StorageDevicePolicies'.
5) Click this new folder and in the window on the right create a new DWORD value, lsbel it
WriteProtect, give it avalue of '1'.
6) Now users will not be able to write any data on the USB.
To turn it off just set th evalue to '0'