This for installing the .NET Framework updates?
Tried this?
When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0,
or 3.5, you may receive Windows Update error code "0x643" or Windows
Installer error code "1603"
http://support.microsoft.com/kb/923100
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Shenan Stanley
MS-MVP
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How To Ask Questions The Smart Way
http://www.catb.org/~esr/faqs/smart-questions.html