Require help with htPasswd

Hi,
I am trying to password protect a folder of my site through htaccess & htpasswd. I read a tutorial at:
weavervsworld.com/docs/other/passprotect.html

and try to so it the same way but its not working. I created both the files so now whenever i try to access that folder it will pop-up the authentication window but even after providing the user name & password it won't allow me to access the site. Neither i am receiving any message like authentication failed or something>

Can anybody suggest what's happening?

Thanks.