thanks for ur reply lurkswithin
i formatted my harddrive by a program called Supper Fdisk 1.0 bootable
I think my laptop supports booting by USB drive, because on "boot order" says like support cd/dvd drive, usb hard drive, usb floppy, usb diskette on key.
My Bios version is F.11, processor is Genuine Intel T1350, and the cd is set to be the first boot choice, and like i have mention, the cd drive is not working properly, thats why i m looking for another way of reinstalling new OS