安装了windows版本的db2 v10.5, 如今无法启动db2

C:Program FilesIBMSQLLIBBIN>db2start

06/06/2016 20:26:21     0   0   SQL1397N  The DB2 service failed to logon

SQL1032N  No start database manager command was issued.  SQLSTATE=57019

去启动services里面的db2，也是报the service did not start due to a logon failure

可能跟我最近改了电脑登陆密码有关吗?

请教如何配置，能够正常启动db2呢？