And then a while ago, I found that the problem CAME BACK AGAIN. But then something suddenly clicked in my head: maybe some application caused this problem. And I suddenly thought, hell, it could be Office 2013, because my M6600 with Windows 8 has almost the same stuff as my MacMini Windows 8 EXCEPT the Office 2013. So I uninstalled Office 2013, and SURE ENOUGH the problem was GONE!
The odd thing is that I COULD NOT find any report on Internet that says the same Daz Studio conflict with Office 2013. I guess I am one of those rare person who happens to use both of them on the same machine.