If by 64 you mean Windows XP 64-bit Edition, then yes it is much better - problem is and the reason I still have Professional is that it is not the same; it is a Beta and the performance difference if not comparable to the loss of the XP Blue, the Graphics and the usage.
Also, you have to download 64-bit Edition; as it only comes with Intel Itaniums from HP. And its not a small download.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.