diff --git a/root/install_portal/install.php b/root/install_portal/install.php
index b20c99f3..6790e695 100644
--- a/root/install_portal/install.php
+++ b/root/install_portal/install.php
@@ -179,6 +179,7 @@ if( $user->data['is_registered'] && $auth->acl_get('a_board') )
 		break;
 	
 		case 'mssql':
+		case 'mssql_odbc':
 			$db_schema = 'mssql';
 			$delimiter = 'GO';
 			$comments = 'remove_comments';
@@ -252,10 +253,10 @@ if( $user->data['is_registered'] && $auth->acl_get('a_board') )
 						}
 					break;
 					case 'mssql':
-					case 'mssql_odbc':
-						$db_schema = 'mssql';
-						$delimiter = 'GO';
-						$comments = 'remove_comments';
+						$sql = 'if exists (select * from sysobjects where name = ' . $table_prefix . 'portal_config)
+						drop table ' . $table_prefix . 'portal_config';
+						$result = $db->sql_query($sql);
+						$db->sql_freeresult($result);
 					break;
 				}