Index: branches/RC/core/install.php
===================================================================
diff -u -r10098 -r10304
--- branches/RC/core/install.php	(.../install.php)	(revision 10098)
+++ branches/RC/core/install.php	(.../install.php)	(revision 10304)
@@ -669,7 +669,12 @@
 		function AlreadyInstalled()
 		{
 			$table_prefix = $this->systemConfig['Database']['TablePrefix'];
-			return $this->TableExists('ConfigurationValues') && $this->Conn->GetOne('SELECT VariableValue FROM '.$table_prefix.'ConfigurationValues WHERE VariableName = \'InstallFinished\'');
+
+			$sql = 'SELECT VariableValue
+					FROM '.$table_prefix.'ConfigurationValues
+					WHERE VariableName = "InstallFinished"';
+
+			return $this->TableExists('ConfigurationValues') && $this->Conn->GetOne($sql);
 		}
 
 		function CheckDatabase($check_installed = true)