[WTF]

That M$ for you, but let me not start the age-old debate between open-source, etc. God forbid. XP generates a hash code of the CPU, mobo and HDD and that hash code is unique. Thus becomes a problem. Talking about an orgininal version here. When you thus change CPU, mobo, HDD (trying to load on other computer and register it) its a no-go. But there are some good cracked versions available on the internet.