This has partly been resolved.
The reason why the WSUS-installations didn't work was because the IE7-setup could not download content from MS's WGA-servers on the Internet.
I've got a transparent http-proxy that denies download of unsafe content (executables, including CAB-files).
It seems like the IE7 WSUS installer demands this, and when I allowed a test pc to bypass the http-proxy the installation went fine.
So... now all that is required is to setup IP-exceptions for all of MS's WGA servers... 
Edited by masken (2007-02-21 04:53 PM)
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The tart is out there
