Arduino MEGA 2560

Dears i have arduino uno and all thing fine with uploading code

but when i develop the work to Arduino MEGA 2560 with trying many steps in arduino web and other web

still could't find usb2.0 serial

anybody have idea

my chip details below Atmel atmega2560 18AU 1446

regards

i'm using window XP can't detect MEAG 2560 usb 2.0 serial driver

Does anything show up under Devices and Printers or Device Manager? Please post screenshots of both.