URI Rewrite and IIS

[eluser]Benjo[/eluser]
Thanks for the quick feedback. I have 2 questions, if you don't mind:

1) where on your server is your httpd.conf located? Mine is located in "C:\Program Files\Helicon\ISAPI_Rewrite3".

2) could you briefly explain what the following lines of your code do?

RewriteCond %{HTTPS} (on)?
RewriteCond %{HTTP:Host} ^(?!www\.)(.+)$ [NC]
RewriteCond %{REQUEST_URI} (.+)
RewriteRule .? http(?%1s)://www.%2%3 [R=301,L]