Sims 4 wont start any more after Windows update

After i installed the newest february 25 Windows update the Sims game wont work, it starts and I only get a white screen or flashes.  Had the same problem after a windows update too last year. All normal measures (exporting the Sims files on PC in a backup and starting again, starting as administrator, repairing and reinstaliing, following the complete helpdesk routine, etc),  nothing helped. My Nvidia app says drivers up to date. My system has more then recommended requirements. There is more then enough memory.  I solved the problem last year after all these measures failed by reinstalling Windows on the PC;  it did work. So I did it now again but it did not help this time.  Sims wont start. Then i again reinstalled Windows a second time out of the Cloud with complete removal of all files on the PC to avoid any corrupted files .  So I basicly started with a clean slate. I reloaded the basegame  again without the extensions and tried playing. Still the same problem. (i did leave all removed files in cloud storage so no involvement there)   I 'm kind of out of ideas what I could still do to solve this problem.