Help with setting up xcode dev environment

This may seem like an easy question but I've been pulling my hair out for about a week now.
I've got a fresh install of Snow Leopard 10.6.6 and of Xcode 3.2.5. I'm new to mac coding so have been following the Hello World just to get into the swing of things. I'm looking to have the interface builder load when I double click the MainWindow.xib but nothing does. The xcode project window looses focus (As you would expect) and it seems like another window is open but I can't see or access it. I am unable to return to the project window (Flickers then turns back to light grey when clicked on) so I have to cmd Q to exit. I've rebuilt my launch directory as advised to someone else in a similar post, arranged all windows to fit onto available workspace and have now run out of ideas.
I would be very grateful if someone could help me.
Cheers

Are you able to launch Interface Builder from the Finder? If not, you should uninstall the Xcode Tools and reinstall them.
If you are able to launch Interface Builder, when you double-click the xib file, does it open in Interface Builder when Interface Builder is open? If not, are you able to open the xib file in Interface Builder? If you aren't able to open the xib file in Interface Builder, your xib file might be corrupt. Remove the xib file from the project and add a new xib file to the project, or start over with a new project.

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