I installed OS X 10.7.5 and Xcode 4.6.3 on a several-years-old macbook (2 GB memory)
I double click on the Xcode icon in the Applications folder and get the "Welcome to Xcode" window with four options -- Create a new ..., Connect to ..., Learn about ... and Go to ... I select "Create a new Xcode project" and get a new window with the "Choose a template for your new project" dialogue. At the top of the window is the indicator showing "Loading." The loading never stops.
I select the Single View Application under iOS/Application and click the Next button. I get the "Choose options for your new project" dialogue and the loading continues. The Next button remains disabled when I fill in Product Name, etc. The loading continues forever.
At this point I'm totally hung up.
Ideas would be appreciated.