Clod, while I still run Windows XP SP3 on a desktop PC, I run 8.1 that I've updated from 8 on an HP Notebook (with Intel processor). HP warns that even if drivers were updated immediately prior to 8.1 installation, "you may need to reinstall some drivers again as some Windows 8 drivers may not migrate automatically to Windows 8.1." They also recommend looking to the PC manufacturer, rather than the processor manufacturer, for drivers with 8.1 compatibility.
I don't know what brand of device you have and perhaps you've heard all this before; but, I thought I'd mention it.
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