> The "capture url" generated this line:
> 
> <http://username:password@www.radioio.com/store/login>
> .php?redirect_url=/?>postfile:E:\BTLS%20Rips\btlsrip
> s\hts-post0
> 
> Is there something I'm doing wrong?
You are using the capture method (>postfile...) AND http authentication
(username:password@)

set your browser to <http://www.radioio.com/store/login.php>
Follow the capture method <http://httrack.kauler.com/help/Authentication> but
remove the un/pw from the insert url box.