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My vodafone dongle is not working. model : K3806-Z | eror - Device not detected.

2: Seeker
I recently purchased vodafone company's  vodafone model: k3806-z dongle product from online. But during the installation of the dongle's software, Windows shows an error that Windows requires a digitally signed driver.
 This error also occurs when installing the last version of the official software released by your organization into my computer.
VMB Softwere says : no device. please ensure all devices are properly connected. 
My OS : WINDOWS 7 ( Ultimate )
Please help as soon as possible. Thank you.
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Good morning @sahaninduvara, where did you purchase the device from? Is this the first time that you have tried to install the device on your desktop? 

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