Thanks Aswain for your kind assistance! I remember weeks before, I have download software from a website and maybe they are using ilivid manager which I have no memory of that now. I have then remove that software but DataMngr_toolbar remained undeleted in registry. There is no trace of such file / folder in Windows Programs through searching of Add/Remove Programs in Control Panel.
I haven't used firefox before as my browser. Do I install it now and go ahead the steps you advised.
Please feedback and I will start to install it and see what the result will be. Many thanks!
Merry, Merry Christmas and Happy New Year!!