Have you tried any of the suggestions at
http://v4.windowsupdate.microsoft.com/troubleshoot/ under "0x80070003
Software Update Incomplete" or "In the process of updating Windows, you are
taken to the Software Update Incomplete page (on Windows XP and Windows
2000)"? Might be some help.

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Kari
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> Cannot update windows Xp? says software data incomplete??
> What is wrong/
>
> Crystal