Thank you BDFD. It's got me stumped. I'm going to try on another Win 10 computer and will download SweetHome3D onto that and see what happens - it's only a HP tablet with Intel HD 5300 graphics card so will be interested to see what happens - don't know what the DirectX or OpenGL numbers are will see if there are any updates before attempting it.
Fingers crossed.
Will let you know.
Many thanks
Lawrie