vs2008 sp1 安装失败

最近想学习下WPF，看了园子上的博文都是基与vs2008 sp1 的， 

下载了VS2008 sp1,结果在安装时总是失败，检查日志，提示：

[11/22/07,18:04:40] Microsoft .NET Framework 2.0a: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a. MSI returned error code 1603

[11/22/07,18:05:13] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a is not installed.

[11/22/07,18:26:27] Microsoft .NET Framework 2.0a: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a. MSI returned error code 1603

[11/22/07,18:26:57] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a is not installed.

[11/22/07,18:49:56] Microsoft .NET Framework 2.0a: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a. MSI returned error code 1603

[11/22/07,18:50:28] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a is not installed.

在网上反复多次搜索，估计.NET Framework 2.0 造成 无法安装。

按照博文下载了个 .Net Frame 清理工具，清理掉.NET Framework 2.0，清理后重新启动，再次安装，成功。

附dotnet清理工具：dotnetfx_cleanup_tool