Installing .NET Framework 3.5 SP1: Receive 1603 Error Code RRS feed


  • Hi Larry,

    Thank you for your post.

    For error code "1603", it's a common message that means "fatal error during installation".

    I looked into the log files that you posted and found the following error snippet:

    MSI (s) (3C:E8) [23:33:53:171]: Hello, I'm your 32bit Elevated custom action server.
    ExecXmlConfig:  Error 0x80040154: failed to load XML file: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\web_mediumtrust.config
    MSI (s) (3C!D4) [23:33:53:187]: Product: Microsoft .NET Framework 3.5 SP1 -- Error 25541.Failed to open XML file C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\web_mediumtrust.config, system error: -2147221164

    Error "0x80040154" means "Class not registered".

    Could you please try the steps mentioned here: http://blogs.msdn.com/astebner/archive/2007/11/01/5826719.aspx which addresses this exact issue?
    Or you can try the workaround in the following similar issue:

    Hope this helps! If you have any concern, please feel free to let me know.

    Best regards,
    Yichun Chen

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    • Marked as answer by YiChun Chen Tuesday, February 2, 2010 4:59 AM
    Wednesday, January 27, 2010 7:21 AM