安装 .NET Framework 3.5 SP1 是发生错误，点击软件界面上的错误日志，显示：
[12/21/12,11:21:20] Microsoft .NET Framework 3.0 SP2 x86: [2] Error: Installation failed for component Microsoft .NET Framework 3.0 SP2 x86. MSI returned error code 1603
[12/21/12,11:21:50] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
[12/21/12,11:34:42] Microsoft .NET Framework 3.0 SP2 x86: [2] Error: Installation failed for component Microsoft .NET Framework 3.0 SP2 x86. MSI returned error code 1603
[12/21/12,11:35:10] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
[12/21/12,11:42:24] Microsoft .NET Framework 3.0 SP2 x86: [2] Error: Installation failed for component Microsoft .NET Framework 3.0 SP2 x86. MSI returned error code 1603
[12/21/12,11:43:17] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
[12/21/12,11:46:09] Microsoft .NET Framework 3.0 SP2 x86: [2] Error: Installation failed for component Microsoft .NET Framework 3.0 SP2 x86. MSI returned error code 1603
[12/21/12,11:46:48] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
网上查了一下，解决办法如下，真解决了：
开始-->运行-->regedit-->HKEY_LOCAL_MACHINE-->SOFTWARE-->Microsoft-->Internet Explorer-->MAIN
在MAIN键值上，右击权限
完全控制 允许........................如果你本身就是允许的，那么点高级-----> 两个地方打钩，应用......... 无需重启，再安装Framework 3.5
