Maybe the Help and Support Center will show you effective group policy settings for the current user....
Start>Help and Support
Under the "Pick a Task" section, there may be an entry titled, "Use Tools to view your computer information and diagnose problems." If it is there, click it.
Click (under "Tools" in the left pane) "Advanced System information" .
Click "View Group Policy settings applied" to show what the built-in settings are.
It's been a long time since I really got into XP's little snares and traps, but I seem to remember a way to change an XP Home Edition's policy settings by using anther XP Pro machine that was networked to the XP home machine. Both machines had to have NetBIOS protocol installed in the network properties. The XP Pro machine contacted the XP home machine by starting gpedit a bit differently.
where dorkymachine would be the NetBIOS name of the target machine. (Dorky, because that is what XP Home is), your XP Home computer probably has a different name. I can't guarantee this will work back to an XP Home machine, but it certainly will from one XP Pro to another... I just don't remember all that well, it has been many years since I played with this stuff, but it won't hurt to try. An Administrator level person must be logged onto each machine.