Doesn't show the proper thumbnail image, please help

Hi everyone, I've uploaded some images into my Gallery, but it didn't show any thumbnail image at all. It show a broken image thumbnail. Any idea what's the cause of this ?

Edit : I've just read this
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I can successfully upload photos, but when I look in my album all I see are broken image icons. Why?

You've specified an incorrect path to your albums directory in the config wizard. You can fix this by re-running the Configuration Wizard and correcting the Albums URL value.
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But this link : http://codex.gallery2.org/index.php/Configuration_Wizard doesn't show anything

URL : http://kelliebellie.net/main.php

Any help would be appreciated! Thanks

The following information is required to get an answer:
Get this information from the PHP diagnostic (in the configuration wizard).
Gallery URL (optional but very useful):http://kelliebellie.net
Gallery version:v2
Apache version:
PHP version (don't just say PHP 4, please):
Graphics Toolkit:
Operating system:WinXP
Web browser/version (if applicable):