WOTLK the graphic settings are not saved

Hi,
subject,
WOTLK the graphic settings are not saved after apply and reopening the system settings window
game ver3.4.1.47612
win 10

tried read only
/console synchronizeSettings 1
completely removed the WTF folder and addons
admin rights on _classic/wow.exe
the whole battlenet folder inherites the “All” rights on “full access”

NOTHING HELPS
the settings go down for a random amount. i set ultras and 10th for everything but after applying and reopening the system window - it become 8-9 points with some settings are worse than was being before