I am unable to open firefox and have it display on the screen. It is on the taskbar, I can see the page but it only stays on the taskbar. What do I have to do to expand it on the screen? Also the other programs can be opened from the taskbar.

FireFox can be opened but it is not usable since I am unable to view and access it on the screen/monitor.
I can open E, Google, with no problem only Firefox.

It depends upon how you want to deal with the situation.  Your old library file (library.itl) is corrupt.  You can try either re-creating the library file or you can just start afresh.
If you want to start fresh, let it create a new library in a new folder. 
We can go into details later.
If you want to re-create the library:
iTunes: How to re-create your iTunes library and playlists - http://support.apple.com/kb/ht1451

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