SQL Server 2008 Remote Procedure call failed

Today, when writing the program, suddenly found that the database connection is not on, open manager found SQL2008 this error occurred.

Very depressed, find a lot of methods are not resolved, and finally think is not to install vs2013 in the SQL Server Express localdb problem, so put this uninstall, re-open manager incredibly can use, and then immediately restart service, can service but failed to start, The reason is: 1069, the service cannot be started because of a failed login. Right-click service---> Properties---> Login---> select Local System Account. This enables it to work. As to this question, said is in is suddenly, originally yesterday used of still good, today can not use, hundred think not its solution ah. I remember yesterday I also did not install what software ah, how can appear this problem, record a bit.