.net Framework 3.5安装出错
[09/27/11,14:20:42] Microsoft .NET Framework 3.0a: [2] Error: Installation failed for component Microsoft .NET Framework 3.0a. MSI returned error code 1603
[09/27/11,14:28:51] 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
[09/27/11,14:29:08] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.0 SP2 x86 is not installed.
[09/27/11,14:31:36] Microsoft .NET Framework 3.0a: [2] Error: Installation failed for component Microsoft .NET Framework 3.0a. MSI returned error code 1603


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参考http://support.microsoft.com/kb/923100/
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http://www.juyo.org/juyo/server/win03-dotnet35-msi-1603/
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return error code 
MSI可能与你的操作系统有关系，当然肯定不会是操作系统的问题，可以做个测试，安装.NetFreamwork 4.0,因为.NetFreamwork 是向后兼容的，也就是说4.0支持3.5，3.0,2.0,1.0
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系统有打对应的SP补丁没，清空下临时文件。