Microsoft Word Not Saving Onto CD ROM

Hello,

I don't know what has happen but, all of a sudden when i am in Microsoft
word and i try to click save as to save something onto the cd-ROM(CD Drive H)
it gives me a message saying:

Incorrect function and then i click okay and it follows it by saying

You do not have access to this folder 'H:/'. see your administrator for
access to this folder.

How do i fix this?

Thank You With Any Help.