Users of Windows XP Home Edition are locked out of the full range of file-security options with one noteworthy exception: When you restart Home Edition in Safe Mode you’ll find the full Windows 2000–style access control editor. This back door is designed for recovery of protected files after a system crash, but a determined Home Edition user can take advantage of it to set permissions on files and folders.
If you understand NTFS permissions and need to use them, get Windows XP Professional.
right click the name that you need and go down 2 properties. one of the options is "make this folder private" doing this will mean only you can acess ur files.even fellow admins can't get in all files in the "my documents" folder will be private now.
this only works on an ntfs file system so you have 2 convert your harddrive.