This Windows xp used without problems a ps/2 keyboard.
Now I've moved it (using noton ghost) to a newer pc (without ps/2) and I think that I'll have usb keyboard driver installed ONLY after successful login.
What can I do? :S
My answer comes from here and it helped me a lot.
First of all, one cannot "move" Windows XP to another computer. Even if you get it working, Windows will ask to be activated, meaning that you would need to shell out for the price of a new Windows XP license (and I am not at all sure that this is even available).
Second, you could first install the USB driver on the old computer using the Add New Hardware wizard, and only then "move" it.
Third, you could reinstall XP from scratch on the new computer, using the installation CD.
Fourth, you could buy a USB PS/2 Adapter.