SQL Server 2008 eval Reporting Services installation fails: Error: Action "SqlRSConfigAction_install_ConfigRC_Cpu32" failed during execution.

Need help to do a clean install of SQL Server 2008 eval.  Running the X86 self-extracting executable, installs with failures.  Reporting Services fails to install properly.  From Summary log:

  Feature:                       Reporting Services
  Status:                        Failed: see logs for details
  MSI status:                    Passed
  Configuration status:          Failed: see details below
  Configuration error code:      0xF49AD2A6
  Configuration error description: Input string was not in a correct format.
  Configuration log:             C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20100224_082520\Detail.txt

From Detail:

2010-02-24 08:53:36 Slp: ----------------------------------------------------------------------
2010-02-24 08:53:36 Slp: Running Action: SqlRSConfigAction_install_ConfigRC_Cpu32
2010-02-24 08:53:36 Slp: Action Data:
2010-02-24 08:53:36 Slp:   Feature = RS_Server_Adv_sql_rs_Cpu32
2010-02-24 08:53:36 Slp:   Scenario = install
2010-02-24 08:53:36 Slp:   Timing = ConfigRC
2010-02-24 08:53:36 Slp:   ConfigObjectType = Microsoft.SqlServer.Configuration.RSExtension.SQLRSConfigurationPrivate
2010-02-24 08:53:36 Slp:   FeatureName = RS_Server_Adv
2010-02-24 08:53:36 Slp:   FeatureCpuType = Cpu32
2010-02-24 08:53:36 Slp:   FeaturePackageId = sql_rs
2010-02-24 08:53:36 RS: STATUS: Install_ConfigRC started

...and so on...

08:58:08 Slp: Sco: Attempting to open registry subkey
2010-02-24 08:58:08 Slp: Sco: Attempting to open registry subkey SOFTWARE\Microsoft\Microsoft SQL Server\MSRS10.MSSQLSERVER\ConfigurationState
2010-02-24 08:58:08 Slp: Sco: Attempting to get registry value RS_Server_Adv
2010-02-24 08:58:08 Slp: Error: Action "SqlRSConfigAction_install_ConfigRC_Cpu32" failed during execution.
2010-02-24 08:58:08 Slp: ---- Flush datastore cache before calling configuration action 'SqlBrowserConfigEngAction_install_Startup_Cpu32'