email-to-blog not working, PHP error

Hello,

I just got WordPress set up today, so I am very new. My problem is with the email-to-blog, when I try to access wp-mail.php I get an error saying POP3 cannot be redefined:

PHP Fatal error: Cannot redeclare class POP3 in D:\Webhome\rants\wp-includes\class-pop3.php on line 19

Where of course D:\Webhome\rants\ is the local directory of where I have WordPress installed on my webserver (though I am accessing wp-mail.php over the web, and not locally). I think I have WordPress working correctly otherwise, posts, comments, emails confirming comments, adding users, etc all have worked, but I can not get the email-to-blog working… any suggestions? I’m not sure of all the details you will need to help me, but I am running my webserver on a WindowsXP machine (with ISS), using PHP Version 5.2.0, and before I had even tired the wp-mail.php once I installed wp-Cron 1.1a pluggin, and activated it. I have since tired it with the WP-Cron deactivated but get the same results. If any other information would be helpful please let me know.

Thanks,
Tyler