Weird twist on a fairly basic problem - upgraded a motherboard on a windows XP system, ran repair install, and windows loads just fine. Click on a user account, windows says "you must activate to continue" and I click yes, windows loads the background image, and then fails to load the activation window. Safe mode doesn't work because windows is not yet validated, and windows is totally unresponsive to keyboard commands.
Anybody know this one?
I believe you NEED to do the 'activation by phone' since this the new hardware will unable you to receive a new key to successfully activate. You might have missed the step where it asks you what kind of activation procedure you want to run. If that doesn't work, try running the repair again as something might have gone south, I've had that happened before.
Update
Did you replace a motherboard bought with the OEM license for your system? You might want to read this: (From http://www.michaelstevenstech.com/moving_xp.html)
You install of Windows is hosed. In this case I would just give up on the repair option.
This is what I would do:
It works for me every time.