problem solved. 
[IMAGE][IMAGE] Although my devices are detected by AWCC, my Alienware CC Components for AWCC is missing, so my keyboard backlight and light bar do not work properly. How can I get back my Alienware CC Components for AWCC driver? Reboot, F10 key and reinstalling AWCC are not working. Please help!!!
About the Alienware CC Components for AWCC for Dell G5 15 5500