Error 1608 Office XP Professional Upgrade

[Brad]

I am trying to move my Office XP Professional on a New PC
w/ an XP OS.

Step 1) I install Office XP Standard - No Problems

Step 2) I try to install the Office XP Professional
Upgrade - Problems ... I enter the Key and I get Error
1608 Setup was unable to locate a qualifying Product.

Step 3) According to support I should put standard disk
in the CD/E drive, choose that drive and hit OK.
Problem - I get the 1608 error again and setup is closed.

AHHHHH

Note: The PC I am moving from is NT and the install
worked fine there.

If anyone has a clue please let me know.

Thanks,

Brad