.NET Framework 3.5 June 2007 CTPセットアップエラー

[07/14/07,05:55:01] Microsoft .NET Framework 2.0a x64: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a x64. MSI returned error code 1603
[07/14/07,05:55:55] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a x64 is not installed.
[07/14/07,06:18:25] Microsoft .NET Framework 2.0a x64: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a x64. MSI returned error code 1603
[07/14/07,06:19:04] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a x64 is not installed.
これはどうしろというんだ。。。(;´ρ`)
前のLonghorn Server SDKと同梱されたバージョンに戻すかなぁ。