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Taskbar Lagging While USB tethering

Hi all,
I am Using Windows 8.1 (Update 1). Whenever I connect My android Mobile to USB and activate USB tethering, the Whole taskbar becomes slow and lagging. Though I can click them, it takes 5-10 Seconds to Switch to other programs.However alt+tab switches to other program with ease. Pressing Start also is lagging. I Cant Click taskbar notification icons also. All these lagging stop as soon as I turn off my USB tethering. I Cant use wifi hotspot also as its connection drops every 10 Minutes or so. I am sure the problem is cause by Windows OS only, because I restored my windows 8 Backup and USB tethering works without any problem.

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    System Manufacturer/Model Number
    Lenovo Ideapad Y500
    8 GB
    Graphics Card(s)
    Nvidia GT650M 2GB DDR5
    Screen Resolution
    1980 X 1080
    Internet Speed
    256 kbps
    Windows Defender

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