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<!-- Microsoft .NET Framework Version 1.1 Redistributable Package -->
<check type="file" condition="exists" path="%Windir%\Microsoft.NET\Framework\sbscmp10.dll" />
<install cmd='%SOFTWARE%\updates\common\enu\dotnetfx.exe /q /c:\"install /q\"' >
<exit code="194" reboot="true" />
<exit code="1603" />
</package>
Another way to run the .NET installer (I was getting the error "command failed: \"install /q\"" with the above):
Extract the contents of dotnetfx.exe, and then invoke the install directly (this also saves a bit of time for the clients)