If you upgraded WordPress to 2.5 and above, you will most likely encounter the Fatal Error problem when trying to activate the Popularity Contest Plugin by Alexa King even if you downloaded the latest version (currently 1.3b3).
Here is the fix for the fatal error:
1. Open popularity-contest.php
2. Scroll down to line 59.
3. Find require(’../../wp-blog-header.php’);
4. Replace with [...]

Popularity: 4% [?]

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