Notice: Undefined index: REQUEST_URI in F:\Domains\mydomain.com\wwwroot\wp-settings.php on line 81

To solve this issue you need to edit the wp-settings.php file.  After line 79 or “// Append the query string if it exists and isn’t null” add the following line:
  $_SERVER['REQUEST_URI'] = substr($_SERVER['PHP_SELF'],0);

This error is due to IIS not recognizing ‘REQUEST_URI’

If you don’t want to make the modification yourself you can download the modified wp-setting.php file from here.