There are many PC virus visit one PC to another by USB device.And often times many pc attracted by virus for risky USB operations. It is advisable to disable your USB port . To disable your USB port first-
* Click on start menu.

* Click on Run.
* Write 'devmgmt.msc' and click on OK.
* Select Universal serial bus controllers.
* Select USB Root Hub.
* Now Right Click On 'USB Root Hub'

* Select on Disable.
Now you have done your job.
* Click on start menu.

* Click on Run.
* Write 'devmgmt.msc' and click on OK.
* Select Universal serial bus controllers.
* Select USB Root Hub.
* Now Right Click On 'USB Root Hub'

* Select on Disable.
Now you have done your job.
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