You cannot move the Microsoft Office installation. It doesn't work like that.
Unless you can borrow the CD from a friend, you will have to buy MS Office again (You might not be able to get version 2003, but 2007).
There is a free alternative to Microsoft Office that I have installed on one of my computers: Open Office.
http://www.openoffice.org/Open Office is able to read, edit, and save Microsoft Office file formats. It consists of Writer/Word, Calc/Excel, Impress/Powerpoint, ect...
And the best part is it's free.
About the game, can you not download it again? Like Office, you cannot simply move the program files.
Regarding your Word Viewer, let it be. The best free alternative would be Open Office.
As for Trillian, I'm not a Trillian user so I can't really help you there.
I am curious if the problem is because the history format is in MSNs format or maybe it's not in the right folder.