Hey nice work with that article!!
Are you familiar with DriverMAX? http://www.drivermax.com/
I actually use it every time to get drivers and put them in Altiris. It really works smooth.
Well, I used your script and I got e1d62x64.INF. Same driver located in that bootwiz folder. Is there a way to see the drivers on a WinPE image? How can I make sure the drivers located here X:\Program Files\Altiris\Altiris Agent\Agents\Deployment\SBS\Bootwiz\{374E1C49-4F58-4F5C-8D51-07A30F0D44AD}\cache\bootwiz\Platforms\WinPE\x86\Drivers\ are going to be in WinPE after recreating preboot environment?
I still think there's something strange going on cos last customer I was at, 7.5 HF6 worked perfectly uploading Latitude E6440 drivers at first. The only difference from both environments is expired licenses, at least at first.