gapan wrote:Do you have a 64bit CPU?

, yes , i use 64 bit computer , just like i said earlier , this thing isnt happen with lxde 64 bit installation disc edition .

I have downloaded kde installation disc 64 bit , i have md5sum it and it say correct file. After using unetbootin to put it in my usb , it can't use it to boot my pc from usb ,(motherboard already taught to boot from usb, and my usb listed correctly) it said
' missing operating system
operating ...