New forum user here.

I'm having a 'little' trouble installing the 1.1.3 ACP add user mod to phpBB 3.1.2. I've copied the root/*.* to *.* as per the instructions.
When I type the URL http://<my host>/phpbb/acp_aumod_install.php I get these errors:
[phpBB Debug] PHP Warning: in file [ROOT]/umil/umil.php on line 157: include(./includes/db/db_tools.php): failed to open stream: No such file or directory
[phpBB Debug] PHP Warning: in file [ROOT]/umil/umil.php on line 157: include(): Failed opening './includes/db/db_tools.php' for inclusion (include_path='.;E:/xampp/php/PEAR')
Fatal error: Class 'phpbb_db_tools' not found in E:\xampp\htdocs\phpbb\umil\umil.php on line 159
I'm running my phpBB on a server which has XMAPP win32-1.8.2-6-VC9 installed on windows XP.
phpBB is working absolutely fine in all other respects. What am I doing wrong?