Help with MS Office and ItunesView

I am a proud MAC user and have been for years now. Here is my problem. One of the things I like to do is tinker with my mac making it do things that are out of the ordinary. Last week I found a way to hide the tool bar in certain apps. Well I think this has damaged my Mac. Now when I open MS word, MS power point, and Itunes I get nothing accept for the toolbar. No document. When I open a document I can minimize it with the shortcut and I see it in the Doc but when I click on it it dis appears. ave I screwed things up and do I need to re-install the OS. I have tried re-installing MS Office but it didn't fix the prob. Please help.