Did you watch carefully as it installed? Did the last line say "Smart Rollback Occurred"? if so, then it did not properly install.
The admin plugin installer ignores your application is on not on the host root, so you will need to manually modify in config/routes.php the line
$Map->connect('/admin/:controller/:action/:id', array('controller' => 'dashboard', 'action' => 'index', 'module' => 'admin'));
to
$Map->connect('/inventory/admin/:controller/:action/:id', array('controller' => 'dashboard', 'action' => 'index', 'module' => 'admin'));
Hope it helps.
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