RegUnloadkey access denied

[future_retro at yahoo.co.uk]

In the following script I can't get the reg key to unload.  Anyone got
any ideas?  I can load and save the key without any problems.  I can
unload the key from regedit and have checked security on the key.  The
docs don't mention any special privileges are needed
(SeRestorePrivilege should do it).  I'm stumped.  Cheers peeps, MW.

import ntsecuritycon
import win32security
import win32api
import _winreg
import win32con

flags = ntsecuritycon.TOKEN_ADJUST_PRIVILEGES |
ntsecuritycon.TOKEN_QUERY
htoken = win32security.OpenProcessToken(win32api.GetCurrentProcess(),
flags)
Loadid = win32security.LookupPrivilegeValue(None, 'SeRestorePrivilege')
#Saveid = win32security.LookupPrivilegeValue(None, 'SeBackupPrivilege')
LoadPrivilege = [(Loadid, ntsecuritycon.SE_PRIVILEGE_ENABLED)]
#SavePrivilege = [(Saveid, ntsecuritycon.SE_PRIVILEGE_ENABLED)]
win32security.AdjustTokenPrivileges(htoken, 0, LoadPrivilege)
#win32security.AdjustTokenPrivileges(htoken, 0, SavePrivilege)

key = _winreg.HKEY_USERS
hkey = win32api.RegLoadKey(key,'Marc','c:\\ntuser.dat')
okey =
win32api.RegOpenKeyEx(key,'Marc\\test',0,win32con.KEY_ALL_ACCESS)
win32api.RegSetValueEx(okey,'test',0,_winreg.REG_DWORD,0)
#win32api.RegSaveKey(okey,'c:\\ntuser2.dat',None)
#win32api.RegFlushKey(_winreg.HKEY_USERS)
win32api.RegUnLoadKey(key,'Marc')