How do I reinstall Windows 7 without losing data if Windows does not start-up?

How can I reinstall windows 7 without losing all my files if I cannot load windows? I receive a BSOD when trying to load windows. But, the windows 7 install only gives two options New install or login to windows for reinstall.

I don't understand why you can't reinstall from outside of Windows.

Edit: this is being fixed so someone. Naturally everyone says restore from a backup but majority of consumers don't backup or know how. This is the error i'm receiving Stop: 0x0000007B (0xFFFFF880009A97E8, 0xFFFFFFFFC000000D, 0x0000000000000000, 0x000000000000000)

Yes i've don't chkdsk, and a countless of other recovery methods. Is it possible to reinstall Windows 7 without logging in? That's the question I want to know, in the past windows versions it was possible.

Try repairing your existing installation first. You can do so by pressing F8 when you boot your computer, and then select the option Repair Your Computer. If that doesn't work, you can boot from a Windows 7 DVD/USB stick to try and repair your computer. You might also want to try System Restore in Recovery options.

Hope this helps!