you need to control access to files and folders by using permissions
Windows XP has 5 built in accounts, (not groups) huge difference.
I don't know if I would recommend removing the 'everyone group' from your windows XP. However, I would recommend having permissions set on the computer. The 'everyone group' includes ALL users who have been on the computer
. Also, if your computer is part of a *domain all users within the domain aswell*. I will say there a few groups within the xp OS thats for sure.
if i remember correctly you need to do this in safe mode as it unlocks another menu. i had to do it once when i had to regain a folder.
edit: i also remember that you only need to go into safe mode if you are running any xp ver apart from xp pro
If you're running xp PRO then go into the admin tools, computer management, go to local users and groups, double click folder in right hand pane to see list of users and/or groups. Also, right click on Users or groups to access the properties and set your options in there.