You know, I’m sitting here now for more then 3 hours and try to install a Windows XP machine. I wonder, after having Service Pack 3 installed, that no updates (which came after SP3) are applied.

The solution is:

Start -> Run...
net stop wuauserv
cd c:\windows\system32
regsvr32 wups2.dll
net start wuauserv

Et voila, everything works again….thx Microcruft.