Fatal error: Call to undefined function _() in C:\\www\\bugdar\\includes\\settings.php on line 41

I tried to find what function it was really trying to call, but I wasn't able to trace it.

This means that you do not have PHP compiled with GNU Gettext. This isn't a problem unless you want to use a language other than English, if it is then you'll need to recompile PHP with Gettext support.

Anyways, here's the very simple fix:

Open install/global.php and find:

require_once('./includes/permissions.php');

After that, add this line:

require_once('./includes/language.php');

Save the file and it should work.

--------------- AUTOMATIC RESPONSE ---------------
Thank you for your bug report. This issue has been closed and fixed in Subversion. This change will be available in a future release, but you can download the change at any time from the Subversion server.