Hi henryjl,
Since the XP Pro is probable an original CD, it contains neither SP1 or SP2 and,
therefore, is considered older than your current operating system.
You only have 2 choices.
1 start all over again and install XP Pro and all of the updates and re-install
any software that has part of it's installation in the windows folder or,
2 stick with Win XP Home edition.