wordpress - (WP 3.0 )Warning: fopen(http://abc.com/wp-cron.php?doing_wp_cron) -

I have just installed WordPress 3.0 and I get this error message on the front page:

Warning: Fopen () [function.fopen]: failed to open stream: HTTP request failed! I: \ Development \ wamp \ www \ mysite \ wp-included \ class-http.php on line 1045

I'm running WAMP Server 2.0i - PHP 5.3.0 - Apache 2.2.11

Does anyone know what this can be?

Thanks to Pat's comment, this problem is "solved" to 'solve' this question For, I need to answer my question and later it has been set in the accepted answer ...