Greetings, I've just switched my GeForce FX5500 with a Radeon 9550 256mb, going by the book, removing the Nvidia drivers, installing the latest ATI drivers and Catalyst with the new card installed. My computer is working properly, but every time I try to access a game, I get an error message like : "Direct3D: Unable to create device. Try changing resolution of color depth " or "Unable to startup 3D acceleration. Please make sure DirectX 9.0c is installed and your video drivers are up to date" and the like. My specs are : AMD Athlon XP 3200+ 2.20 GHz 1 GB of DDR ram Plug and Play NEC Monitor ATI Radeon 9550 / X1050 series I've reinstalled the ATI drivers twice, did the same for Direct X, the latest version I found on the net. Any clue on what I should try next ?