Yeah - it looks like you have a Windows XP Upgrade CD - which won't upgrade from XP to XP. You'll have to get a normal Install Version or - if you don't have SP2 - install it and it will clear up Registry keys because of the vast changes it makes to XP.
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.