Symptome:

Vous faites un repair de windows xp et une fois qu'il redémarre, il vous dit que vous devez l'activer... alors vous faites oui mais rien ne se passe.

Solution:

Download Internet Explorer 8 and Hotfix KB946501, burn them to disc

Hotfix KB946501 http://support.microsoft.com/default.aspx/kb/946501
Internet Explorer 8 http://www.microsoft.com/windows/internet-explorer/default.aspx

Start your PC and repeatedly hit F8 to get the safe mode menu.

Choose safe mode with command prompt only (if you are unable to enter safe mode otherwise)

When the command prompt appears type "explorer"

Should load the Windows GUI behind the cmd window

Install the KB946501 hotfix from your disc (may not need if you're not multicore)

Install IE8

Reboot normally in to Windows, you should be able to activate as usual.

Apparently the activation Window is dependant upon IE.