1. To Check the version:

  On Registry check the following for SQL Server version

   \\HKEY_LOCAL_MACHINE\Software\Microsoft\Microsoft SQL Server\MSSQLServer\CurrentVerion

    From the version number, you can drive it's Service pack and hotfix level.

2. Change the SQL Server service account to 'Local System account" from the Control Panel --> Services for SQL Server. Then put the current password in SQL Server for the Windows  domain account.

  Since the password change for the SQL server service account will not reflect in SQL Serve. It need to be change manually.