Very large windows 10 update yesterday, had wondered why my PC was running slow all day, due to the downloads. The only thing that usually gets messed up is that my sound settings get altered ie: no sounds from the front headset ports, and the sound manager does not work. Eventually reinstalled the realtek sound manager and sorted out connections which now work.
The biggest annoyance is that all desktop shortcuts have returned with arrows on the icons, so, again had to download the latest Windows Tweakui program which gives the option to remove the arrows, saving having to edit the registry to do the same job.
All back to a working system now.