Well you have to worry about the preference file to start with because that has your license and your settings. The first question I have to ask you are you running lion or Snow Lepord?
Then find the Preference file and move it to /YourHardDrive/Users/YourUserName/Library/Preferences/ and make sure you put those Preference files back.
No it's been a long time time sense I used a MS Office suite so I am not sure where to put the MS Data file. Hopefully others here might have MS office installed and can find where the other files are located, sorry.