（1）打开Manage Studio。
（2）click on the .sqlexpress, select property, click security, make sure use mix...
(3)click security,find sa account, enabled it
(4)reset sa password
(5)make sure you can login with sa
（1）打开Manage Studio。
（2）click on the .sqlexpress, select property, click security, make sure use mix...
(3)click security,find sa account, enabled it
(4)reset sa password
(5)make sure you can login with sa