I have bought a dell inspiron 15r 5537it has amd radeon hd 8850m graphics card I am not able to use this graphic card it is using intel hd graphics i tried disabling the intel hd graphic in device manager but when I disable intel hd graphics the amd radeon grachics shows an error like no amd radeon graphics or no drivers installed but I have installed the amd radeon drivers for 8850m but also the same error is displayed. My laptop os running windows 8.. plz some help with this... I have tried unstalling amd radeon drivers and re installing but no use the same problem is occurring.... this message will display when I disable intel hd graphics.. no amd radeon card or drivers