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Network Card Disabled When OS Loads Except When I disconnect All Peripheral Devices.

EliteBook 8770W
Microsoft Windows 8.1 (64-bit)

When Booting to Windows 8.1 login screen, my network card is disabled when I have ANY peripherals connected to USB.  When I disconnect all peripheral devices, it discovers the network card before the login to the OS. What is going on in the BIOS and the boot process that it ignores the network card when peripheral devices are cinnected? Or this is Windows issue?

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