INF file extension for a plain text file
INF may be a file extension for a clear document employed by Microsoft Windows for the installation of code and drivers, conjointly stated as a Setup info file. The INF file contains numerous sections that specify the files to be traced, changes to the written registry. etc.
Go to device
manager and click to expend Network Adapters, then right click Broadcom driver
choose Update Driver Software :
Click on Browse
my computer for driver software
Then when it
asks for the driver, point it towards the folder that contains the .inf
file and click next.
That’s all it will
proceed to install the device driver. 
The normal technique to put in a .inf file is to right click thereon and choose Install from the context menu. However, it is also doable to put in from the instruction. The syntax is:
C:\> rundll32 syssetup,SetupInfObjectInstallAction DefaultInstall 128 .\.inf
Check the unknown device with USB ID
CD drive cannot eject