If you run REGSEC.EXE from the resource kit, local users will experience:

. Desktop icons as plain yellow folders.
. Lose of double-click on My Computer and other desktop shortcuts.
. Explorer.exe will display default Windows icons for all files.

REGSEC remove the Everyone group permissions on:

HKEY_LOCAL_MACHINE
HKEY_USERS
HKEY_CURRENT_USER
HKEY_CLASSES_ROOT

There is no help file and when you run REGSEC.EXE /? or similar, it executes, removing the permissions.

To restore normal behavior, add the Everyone group with Read permissions to the above keys, using Regedt32.exe.