However, based on what you’ve provided you’ll need WinXP Media Center Edition at a minumum to manipulate group policy.
– Start
– Run
– gpedit.msc
To manipulate file security you’ll need to turn off simple file sharing as follows:
– Start
– My Computer
– Tools
– Folder Options
– View
– Scroll to the bottom and uncheck, “Use Simple File Sharing”
** A cautionary note, group policy as well as file security are complex topics and should only be modified by experienced professionals. Proceed with caution!