First impressions are that Windows XP is a step backwards from Windows 2000. Too many setting are buried behind layers, supposably protect to dumb user from themselves.
I am running Windows XP Pro on an AMD 1700 with 640 MB of RAM. It was a clean install three days ago. The accounts include the default administrator, one user with administrative rights, and four limited users, all protected with passwords.
The limited accounts could login at first. However, the security settings became a pain in the backside. For example, for a limited user it would not save the Norton