Did you get to the bottom of this? I’m in the same place: WP 3.5.2, fresh install of the plugin with no other plugins installed but I get:
Plugin could not be activated because it triggered a fatal error
<code>Parse error: syntax error, unexpected $end in E:\Program Files (x86)\EasyPHP-12.1\www\bullsfoundation\wp-content\plugins\my-twitter-widget\widget.php on line 229</code>
thanks in advance