Email feature (smtp) ERROR

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Hello all.
I've installed my site now, but when I then enabled the send email feature I got this error message:

[code]Warning: Cannot add header information - headers already sent by (output started at c:\phpdev\slivern\includes\application_top.php:509) in c:\phpdev\slivern\includes\functions\general.php on line 29[/code]

All I did was choosing SMTP, and then "Enable send email"... the error message is returned when visiting account.php and checkout_shipping.php and when you send an email through contact_us.php.

[b]FACTS:[/b]
[list]Running OSC ms2[/list]
[list]PHP v4.2.3[/list]

If you need more infos plz relpy...