Those of you who have checked Bindows Update will know that MS have released .NET v3.0 to keep XP in line with Vista.

There is an issue with the installer on some machines where it gets half way though then crashes with a generic ERROR 1603...

Try this to resolve the issue and fully install .NET 3.0...

Microsoft .NET 3.0 installer crash fix
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The following steps should resolve the install problem:

Run “net stop iisadmin”
Run “sc config iisadmin start= disabled”
Install the new NETFX3.
Run “sc config iisadmin start= demand”
Run “net start iisadmin”

Hope this helps some people - it worked great for me!

Be sure to download the .NET 3.0 web installer package from the MS downloads page for the install...