Thank you major Payne and all others for your suggestions. I talked with MS yesterday and here is their answer.
...Since the computer is a laptop and delivered with a "Windows XP Home 'Edition" in an OEM format. The only way to make the computer to work is by installing the "version" of the XP that it was delivered with. Then update it with the appropriate servicepacks. I can not
buy an new XP in a shop and install that...
I can understand this reasoning when talking about drivers
and hardware specific software, and there is a separate cd with all the machine specific drivers. But that it is valid for the complete operative system I find a little problematic.
But this is the message anyway. It should be mentioned that the laptop is a HP Pavillion ze56xx.
There is also an other finding in this process. When a laptop is installed with a normal version of the XP, the computer runs faster than when the OEM version is installed!?
Any ideas anyone?