Hi Brink
Problem Solved!!!!!!!!!
Some *Bast***ly* theme or tweak (sorry about that) removed some of the default fonttypes Segoe.
Comparing the set of fonts with a fresh installed drive let me discover that at least 10 versions had been removed. That explained the striketrough as I pointed out in the pictures above. Windows choose offcourse related types which unfortunately were bold and expanded their menu's outsizing the dialogbox.
So happy me, no trouble with days of reinstallings and endless options.
I copied the missing set into the working one and causa finita.
Thank you for your replies en hope that this will be a lesson for others not to play with defaultfonts without a good restorepoint or backup before adding changes. The reverse may not be possible as I found out.
With regards