If you have tried to install an update for the Microsoft .NET Framework 1.0, for the Microsoft .NET Framework 1.1, the Microsoft .NET Framework 2.0, the Microsoft .NET Framework 3.0, or for the Microsoft .NET Framework 3.5, you may receive either of the following generic error codes from Microsoft Windows Update.
Errors: “0×643″ or “1603″
When these error codes appear, it means that the update has not installed due to a problem with the installation process.



