This tip provided by Gilles Pion
Go to: http://www.microsoft.com/ntserver/nts/downloads/recommended/ scm/default.asp
Instructions: Download the x86 (Intel) version of the Security Configuration Manager and save it to your hard disk. Double click the SCESP4I.EXE file you downloaded and extract the contents to a temporary location on your hard disk. Then open the folder you extracted the files to and locate the Setup.inf (Setup Information) file. Right click Setup.inf and select Install. After the installation is finished, reboot your computer.
WARNING: Adjusting the permissions on a drive, file or folder can lock even the Administrator account out of that drive/file/folder. Deny Permissions take precedence over Allow Permissions, regardless of your group membership. Administrators are members of the User's group, by default. Uncheck Allow, rather than using Deny.
Quoted from:
http://www.dougknox.com/xp/tips/xp_home_sectab.htm