Thanks to Brendan and those who have helped with their suggestions. It has encouraged me to pursue the solution.
I have uninstalled and reinstalled all drivers. Like what Brendan said, I found that only drivers from qhyccd.com work. For those who have same difficulty like me may want to use the drivers from:
http://qhyccd.com/download.html
Take note to download the QHY5 update driver as well. And you must also use the QHY5 ASCOM driver.
Cheers.
Alfred