Igor, Thanks... After reinstalling my PC I had a lot of trouble getting Adobe Lightroom to work and also some games! They were also freezing. By updating drivers, I got them ok again. Unfortunately, this did not work for PTE. I did the Direct3D test before without problems. I decided yesterday evening to replace my video card (PNY NVidia 6200) by my older card again (MSI NVidia 5600). Now everything works fine!! The PNY card is for the bin ;-) Thanks.