This relates to topics already existing on the forum, but many of which appear to have no solution, and some of them stopping at a solution less than optimal.
The problem for me was that when recieving a freshly installed PC, even though provided with admin rights, windows did not allow for devices to be installed. I could install the drivers, but once the USB was connected, windows denied the completion of the install.
After digging deep into various proposals of disabling signed driver requirements, reinstalling Arduino IDE, manually installing drivers etc etc we stumbled on to a the REAL problem.
My windows installation came with a registry entry parameter called "DeviceInstallDisabled" set to 1.
The solution once found - really simple:
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open regedit
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go to
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DeviceInstall\Parameters -
change DeviceInstallDisabled to 0
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restart !
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done !!
hope this helps someone!