Receiving 404 errors when using multi user function

Hi all,

I’m receiving 404 errors when using multi user function, when I create a sub-directory site such as http://blog.internal.net/username the blog is created but I see a 404 error when visiting it, the edit and backend links work fine. I’m running WordPress on Apache running on Windows.

I have a .htaccess file in C:\Apache2\htdocs (which contains the wordpress files).

The .htaccess file contents are:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]
# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

My wordpress install is installed at http://blog.internal.net, so the sub-directory blogs are http://blog.internal.net/jsmith and http://blog.internal.net/pjones etc.

Thanks for any help, we’re desperate to get this working.
Steven