Hi Rodenight,
It was clean install, the latest drivers for W 7 from Nvidia.
Computer: Core 2 Duo 6300, 2 G ram, Geforce 7900 GS, Samsung 80 G 7200, Asus P5B Deluxe. When installation is done, everything works fine, but later this feature just disappears. Maybe you or someone can suggest something... (sorry for my English)
Marrio