I'm amazed that none of the many experts who contribute to this forum have yet to post ideas for you, so perhaps this will revive your thread.
You don't say which OS you are using and my own experience of Word runs from version 2 (on Floppys) to 2007. Over that time the files on the CD or DVD have become so mysterious. Gone are the days where I simply ran Setup and followed that with the easily found "Winword." +
However, it seems that your installation disk will not Autorun and as a guess you might look using Google - for enable/disable Autorun.
I've tried insterting my CD (2007) and though it takes a few seconds before anything happens at all, when it does there is a window offering repair, installation and uninstallation etc, regardless of whether or not Windows Explorer is open.