If you use your PC shared area ( cafes, libraries or even offices) malware can get through your PC via connected USB. 

You should disable the computer’s USB port to help keep your system safe from malware stop your data from being stolen. 

1. Open Device Manager ie. press and hold windows + R to open the Run Dialogue box. 


2. Type “devmgmt.msc” and click OK 


3. Expand the Universal Serial Bus controllers list.


4 Right click the USB port and click “Disable Device” 


Conclusion: If you are sure a USB doesn’t have any virus or malware, go through the above steps and select “Enable” to connect the USB.