Nagual suggested that I should uninstall my display-drivers for my old card. I did and installed the new ones. First it looked like it was the solution for my problem. But...the real problem was that I must have Intel ATA66 drivers installed. Otherwise my computer behave like I described in my first mess. Nero Burining Rom 5.0 dosen´t work with Intel´s ATA66 drivers in my system. I don´t know why. So I changed to windows2000 standard drivers for the second IDE channel. After I did that I couldn´t turn off my PC. But I didn´t reliaze that because at the same time I changed the driver I installed also the new gfx-card. So I thought it was that card who caused the problem. Now I have unistalled Nero