Need help installing Office 2004-Word & Excel unreadable

I re-installed Office 2004 recently in my MacBook Mac OS X version 10.4.11. I am the registered owner. Both Word and Excel started acting up recently, likely due to opening contaminated Word and Excel documents. After the re-installation, the icons appeared in the dock. Next, I updated MS. I got an error message, then noticed that the Entourage icon is now a Question mark. When I re-open a Word document, it is unreadable. Ditto for Excel. I had also deleted MS User update before the installation.

What step did I miss in the installation?

Why is the System Preference all messed up when I restart the MacBook?

 

The problem seem to have fixed itself - I'm not sure what I did but I must have done something right - Office 11.5.5 update completed without any error message today. Appreciate your question and thanks for checking.