Ignore their advice to select Background Services under Processor Scheduling, as it is not relevant to Cubase these days.
Re the individual disabling of power control for USB devices, I suggest unchecking the Allow the computer to turn off this device to save power option for all devices with a Power Management panel in both the _Human Interface Dev_ices and the Universal Serial Bus sections of Device Manager. This may also get rid of some Bluetooth keyboard response problems as well. Note that changing USB connections around may cause the box to be checked again.
Re keeping drivers up to date, Win 8.1 seems to do a pretty good job of doing that, with the advantage that it only installs what is absolutely needed, rather than the bloatware that using the ‘official’ drivers often involves. I have found many times that using the ‘official’ driver packages, especially for video, Ethernet, Bluetooth and system, problems have been introduced, which disappeared when I uninstalled the packages, rebooted, and just let the OS do its automatic driver download thing.