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you should never have more than 1 driver at any given time for graphics other than msgeneric one. if your still using catalyst try to get 15.1 or atleast 14.8
either way go to programs and features uninstall amd catalyst or amd software as such. reboot and go back and see if it is still there and repeat until amd is gone. then reinstall full package.
also if any issues remain. there is a website i cant totally remember the name but its called something like (old driver database. c o m) google it if needed.
a little off topic but i have to add this. im not familiar with the r9 255 but.
i have a hd6850 . i managed to install AOD then catalyst 13.8 also use 14.3 later. i then pulled out the driver somehow lol and stuck in a wild driver for something else and made that card run like a graped ape. lmao. yea its burnt brown and warped and runs like its brand new lol...