Did you see this usenet post? Maybe you should try to contact this guy...
From: Jamie Hunter [MS] (JamieHun@online.microsoft.com)
Subject: Re: WinXP - The data is invalid
View this article only
Date: 2002-01-25 11:15:15 PST
"Steve" <email@example.com> wrote in message
> I get this message whenever I try to install new hardware. I did a fresh
> install with only the video card installed. I tried to add an Intel NIC.
> When it found the card and tried to install the drivers, it said that it
> couldn't complete the installation because 'the data is invalid'. I did a
> reinstall (formatted the drive) and the NIC drivers installed correctly.
> Then I tried to add an SB Audigy. I got the data is invalid message again.
> What is causing this?
Steve, in your windows directory (normally c:\windows) you will find a file
called "setupapi.log" please send that to me directly (drop the "online"
from my email address).
<i>It's always the one thing you never suspected.</i>