OK, I understand your position, but try to understand ours.
Your problem is neither DriverPacks related nor is it a problem when using DriverPacks with universal imaging. That's why I moved the topic to "Other".
Your problem is product activation...period.
First, you need to determine what media type & key you're trying to install.
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The product ID can be found in your installation source CD in \i386\setupp.ini
If in fact you are installing a Retail version of XP, then each machine will have a unique activation key and must be activated over the internet or phone.
A VLK (Volume License Key) version of XP uses a single key to unlock a fixed number of machines (10, 100, 1000+) and the machines require no online activation.
OEM SLP (System Locked Preactivation) versions of XP use several key files to lock a copy of XP to a specific manufacturer (HP, Dell, etc.) and these machines are preactivated during XP setup and require no online activation.
All versions require validation to access MU/WU and it is this WGA validation process that you are failing which means that somewhere along the line you are not following the rules regarding activation/licensing.
The MAR program is actually a great benefit to the community and at a great price point. It's a blend of Retail/system builder OEM license/media. I'd be interested in seeing what they include in the OPK (OEM Preactivation Kit).
So once you determine what type of XP you are installing, then we can help you with your activation/validation issues.
Just so we're clear, we WILL NOT help you engage in piracy or other illegal acts.