Recently found this KB that explains some of the Start Menu policies fo XP that can be used.


Policy Settings for the Start Menu in Windows XP
http://support.microsoft.com/kb/292504

SUMMARY
This article provides descriptions of the registry entries for policies that you can apply to the Start menu in Windows XP.
MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

You can use the Group Policy editor (Gpedit.msc) under the following location to configure Start menu features:
User Configuration \ Administrative Templates \ Start Menu and Taskbar
Note: Except when noted, all of these registry settings are under the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
The registry entries are DWORD values. A value of 1 is enabled, and a value of 0 is disabled.