Windows 7 won't start - No error message

When I turn on my Dell Vostro 1015 laptop, here is what happens:

1. Dell icon and loading message (which is normal)

2. Black screen and "Windows is loading files" (never happened before)

3. Then the Microsoft Corporation loading bar stays on screen for some minutes

4. Screen with blue background, green leaf and a white bird appears. And it stays on, no matter how long i wait.

I get no error message, no glue how to react or how to move on from this screen.

What should I do?

Thanks.

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