Dear all, It took me hours to figure out the problem and searched for the solution. I found many people get the same issue, but unfortunately, there was not any solution. Please help me to take a look at this problem. I used Windows 7 Home premium SP1. I installed **SQL express 2008** and it failed. It said that: ***"Wait on the Database Engine recovery handle failed. Check the SQL Server error log for potential causes."*** I checked to the log file and found this: 2012-04-28 23:16:33 Slp: Error: Action "SqlEngineDBStartConfigAction_install_configrc_Cpu64" failed during execution. 2012-04-28 23:16:33 Slp: Action "AgentScriptConfiguration_install_rc_Cpu64" will return false due to the following conditions: 2012-04-28 23:16:33 Slp: Condition "Feature dependency condition for action: AgentScriptConfiguration_install_rc_Cpu64 The condition tests feature: SQL_Engine_Core_Inst_sql_engine_core_inst_Cpu64. There are 10 dependant features. The feature is tested for results: ValidateResult, Result." did not pass as it returned false and true was expected. What should I do with this problem? I appreciate every hint/idea/suggestion from you all.