STC51 SCM experiment board connection problem............. Nasty!

STC51 SCM experiment board connection problem............. Nasty!
http://www.siliconray.com/thumb-usb-stc-8051-mcu-programmer-1.html
My laptop computer, win7 system, STC51 single-chip microcomputer integrated development board, today even for a long time, not even, vexed. Main condition is the USB cable to connect the development board, development board to electricity, but the computer can not display port, plug in USB line computer also computer end have no reaction, connect once before success, don't know why there has been even. The reason is the line, or the cause of development board, or the cause of the system? To help! Problems added:
Have, but also will burn in the program... If can appear port I knew how to do, the key is even port wasn't out...
STC microcontroller basic is through RS232 serial data transmission. If development board no 9 a needle (hole) interface, that your development board must be integrated with USB turn RS232 chip, so want to install the driver. -each development board is not the same. Suggest you ask to sell to you how the people development board make. (dizzy, 100 words restrictions