So I'll get to the point. I'm about arms deep in a HP Integrity RX2620 in terms of sweat and money and come to find out my product key is not playing ball, I cannot proceed with setup.
I've tried calling the Microsoft Activation Center since the disk is an old MSDN disk. No joy, I was told to contact a local technician and could not get another phone number

Any tips or advice?

I think there's a product key that may or may not work in unattend.txt. Give that a try.

I'm not sure where or how to find the unattend.txt. Would this be on the disk?

It is located in the IA64 folder on the CD.

Found it!!! I at least have the product key in the unattend.txt file for the disc!

What a relief to have a starting point. Thanks guys!

((P.S. For those who are wanting to know the same thing, I had to copy the ISO from the MSDN disk onto my desktop, burn it to a cd, and THEN look in the IA64 folder to find the unattend.txt file! HEADS UP!))

I know poking this is a bad Idea but:

It worked, they key in the unattend.txt worked for me!