MS Office Enterprise 2007 Error 1704

This error message transpired while I am trying to install MS Office Enterprise 2007 package. It says that the installation is suspended and that I need to undo some changes made. What would happen if I decide to click on the yes button which is allowing the installation do undo some changes? I don’t have any clue on what is the message “undo” is referring to. What are the pros and cons for this action?
Please enlighten me on this matter.
Thank you!
Here is the screenshot of the error:

Error:
Setup
Error 1704. An installation for Microsoft Office Enterprise 2007 is currently suspended. You must undo the changes made by that installation to continue.
Do you want to undo those changes?
