I was had the same problems i use DNA drivers but remember uninstal old one restart pc and than instal DNA drivers i use this
...............> https://www.idg.pl/ftp/pc_5136/ATI.DN....3.5.4.12.html maybe help or if not work tru omega drivers 3.xx to this you must download catalist 6.xx and try its not work if you overclock you graf.