I've recently installed Windows 8 on my laptop. I can display and copy/paste chinese characters fine in a web browser (e.g. textbox control) or in MS word, but in notepad or in the IE address bar they are just displayed as boxes.
In skype, I can type chinese characters OK into the input box but in the chat history area they just appear as boxes.
I have checked with a couple of colleagues and they don't have this problem. Arabic and Thai also seem to work fine for me.