Exisiting Windows 2000 Licenses Help Needed With Windows Xp Software Please!!!!?

Help needed with windows xp software please!!!!? - exisiting windows 2000 licenses

He had built a new PC, but get rid of my widows XP and Windows 2000 share, he said that the strict security measures! In any case, I have the love and a copy of Windows XP and thought if I downloaded the software only upgrade my existing Windows, but it does not work. It was stored in a controller of another. So I have Windows 2000 with all my assets, documents, etc. on the reputation of Windows XP, I can, as is Jack. Can someone tell me how to change all my personal information / programs since 2000 to XP? HELP ??!!!!! Thank you :-)