Thx for your reply guys!
Myron, I've tried your method to download Bonjour print services for Windows then go to Mybooklive.local but on the website it say 'The network link is down or has become intermittent. Please check your network connection.'... so it still couldn't detect my HDD.
I also tried download Smartware from WD website but it also couldn't detect my HDD...
I'm using ESET smart security anti virus/firewall, do you think is possible that it block my pc from detecting the HDD? I've tried to look into the anti virus but I've no clue how to unblock it.. thanx a lot for your help!