How do you disable the USB ports through the Active directory policy settings?

I need to control the USB devices that are plugged into the office computers, since these devices such as flash disks and external hard drives do pose a threat to the security of the business data as well make us prone to viruses. The problem is the keyboard and mouse are USBs so the solution has to somehow not allow USB storage.
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the best software for enterprise use would be device lock
you can allow or disallow any device using this,even the serial ports
correct link would be
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i used sysinternal USB block tool for 200 PCs and it worked perfectly.....
cactaiAuthor Commented:
Im trying not to use any third party software, thanks for the suggestions, Im trying your solution Bawer!

above mentioned is the sysinternal website since its now with Microsoft so be assured it will not create any issue, i am still using it without any problem....
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