Thank you for your question. I followed the guide in the link you provided, on a clean installation of Drupal 7, and it is working successfully.
We are happy to help, but will need a little more information to troubleshoot the problem.
What is happening when you attempt to enable clean URL's? Are you getting any error messages?
Also, here is a link to our walk-through guide on enabling clean URL's in Drupal.
If you have any further questions, feel free to post them below.
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