Software Deployment

I'm packaging Adobe Acrobat 8.0 Standard and Professional. Both are already in MSI format so I just created an MST which takes the defaults and added the serial number. Now when I push these installations, it bombs at the very beginning. The error message is: "xxxx-xxxx-xxxx-xxxx-xxxx-xxxx Error" where X is the serial number. When I install this manually with the same serial number, it works. Is Adobe purposely blocking this so you cant push this out to multiple users? From what I understand, Adobe lets you use one serial number for multiple installations, you just have to pay for each seat.