Need Asking for 301-Redirect

im want to ask about 301 redirect
my site is domain.com and already using 301 redirect to http://www.domain.com

Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain.com [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R=301]

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im installing wordpress to in my domain.com/blog/

but when im accesing domain.com/blog

my firefox is showing me an error page
like

The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

* This problem can sometimes be caused by disabling or refusing to accept cookies.

Click to expand...

can someone help please to solve this problem

thanks before

someone help please