problems about 3100

i've brought a DKU-5 cable and 've got the driver but actually i don't know how to use it.So i searched from the Net to get imformations and i've found this :

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Now, you got to do the following: Make sure that you have no Nokia PC Suite installed on your computer! If you do, uninstall it and after that, delete also it's folders manually. Make absolutely sure that you are complete rid of it! Also uninstall the Nokia drivers for the DKU-5 cable.

Then shut down the computer, and disconnect the cable.

Boot the computer, and wait untill it is fully booted (idle). Give it a few minutes..... Then connect the cable to any USB port, but ONLY the cable, not the phone!!! That is important!!!

Windows now comes up with a message saying "found new hardware..." and also tells you which kind of hardware that is. And THAT i need to know :)

If it is something like "Serial-USB converter", you can then install Nokia's DKU-5 driver, which is 100% compatible. After you have installed it, reboot the computer. Do NOT disconnect the cable, and also do NOT connect a phone!

After the computer has booted, check via start-settings-control panel-hardware-device manager if there is a device with a yellow question mark. If there is, you have driver trouble. If not, check if there is a device "USB-serial converter" or similar installed and "working properly". If so, continue.

Close the device manager, and install PC Suite. DO NOT CONNECT PHONE!

After installation, again reboot the machine. Start PC suite, and cjheck via it's connection manager if the DKU-5 is detected and used as the standard connection, if not, set it that way. If necessary, set the correct COM port also, you get it via checking the device in the device manager, normally it uses COM 5.

THEN connect the phone, and now it's got to work! If still not, you might have a faulty cable.
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I've followed these instructions,but at last when i connect the phone and choose the COM5 port,it still has no response.

P.S. : I'm from MacaoSAR(a city of China),so my English is not very well.I'm sorry that some of u don't understand my word . >.<