I have a ATI THEATER 550 PRO with a CODE 10 ERROR i read the details and it says: "driver was installed successfully, but problem occurred when attempting to start, the error is code 10" . I have installed the latest drivers from ATI's website and have found no cure to this issue. I have had this issue twice before and each time i have had to reinstall my system with vista service pack one and install all the updates and then it functions properly .... I am now using WINDOWS VISTA ULTIMATE 64 BIT with service pack 2, fully updated . When i search for an updated new driver, it says driver is up to date, and will not let me roll back driver either .... Second post i am making as i did not get an answer the first time . ATI had no answer when i called... Nor did Microsoft ...