I'm getting following error while trying to install backup exec infrastructure manager 12.5

Symantec Backup Exec Infrastructure Manager 12.5

01-20-2010,21:34:13 : Executing PreInstallChecks
01-20-2010,21:34:13 : Executing CPreRequisite::IsAdministrator
01-20-2010,21:34:13 : Executing BE_SetSQLxLangVersion. Setting language version of SQL Express BESOLUTION instance.
01-20-2010,21:34:13 : NLS (0) version of SQL instance found on this system.
01-20-2010,21:34:13 : BESOLUTION SQLx setup file is SQLEXPR.EXE.
01-20-2010,21:34:26 : CDlgInstallSIM Pass Function.
01-20-2010,21:34:26 : C:\Program Files\Altiris
01-20-2010,21:34:40 : CDlgInstallOptions Pass Function.
01-20-2010,21:34:40 : C:\Program Files\Microsoft SQL Server
01-20-2010,21:34:44 : InstallProducts Entering
01-20-2010,21:34:44 : Executing BEIM_SetSQLMaxMemory
01-20-2010,21:34:44 : Set SQL maximum server memory returns: 0
01-20-2010,21:34:44 : Installing SIM
01-20-2010,21:34:44 : InstallAIM Entering
01-20-2010,21:35:12 : The Symantec Installation Manager used 0 MB bytes of disk space.
01-20-2010,21:35:12 : Configuring SIM
01-20-2010,21:35:12 : Launching SIM
01-20-2010,21:36:23 : The installer encountered an error while launching the Symantec Installation Manager. Error 1

Any solution???