Hi,
There are few machine on which USB is disabled by group policy but still if i plug in a USB pen drive then its gets connected and gets displayed on desktop. Many times i have updated the the gpo on the machines by gpresult /force cmd and restarted the machine but still it doesn't work. USB disbaled policy are applied on the this machine and this is confirmed by generating the RSoP and gpresult /h report.html or gpresult /r /scope computer. The usbstr.inf and usbstr.pnf (something like this) permission are only for system and no privileged permission are given for any user.
Is any thing remaining to check. What else is need to do to block the USB ports.
Thanks for helping.