Your options are to reformat your drive and install the "full English
version" of Windows XP or create a dual boot configuration using a
third-party
partitioning program such as Partition Magic (
www.powerquest.com). One
cannot upgrade or change one language version of XP to another.
Cannot Upgrade or Install a Different Language Version of Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q282089