Failed to start the database service MSSQL$SharePoint

1. Go to “regedit” through run command, 
2. browse thru “HKLM_Local_Machine/Software/Microsoft/Shared Tools/Web Server Extensions/12.0/WSS/”. 
3. Then change the value of attribute named “ServerRole” from SINGLESERVER to APPLICATION
4. Then save it 

Now when you run the wizard it will now show you the sharepoint application installation wizard