Since i am new here, and after thoroughly checking if i could find this somewhere else in this forum, i decided to give it a try. After installing Vista Ultimate 64 and Catalyst 7.1 my Vista logon screen rolls. I can enter my pasword, and then all seems okay again, for about 5-10 minutes. Then i got all small dots, grouped in 5-6 dots, all repeated over my screen. The same happened when uninstalling the 7.1 drivers and installing the 7.2 drivers. I have an AMD X2 4600+ with 2GB of ram, and i have a Tagan 450watt power supply. In Win XP Pro I do not have any problems with the card. Anyone any clue as to what can cause this? I have 6 HD's on Sata, 2 DVD-burners on IDE and 1 HD on IDE, and an external HD via USB2. My mainboard is an MSI with NForce 4 chipset, all running perfectly under XP. Also my mainboard and graphics board temperature are around 40C, so nothing special.