Your error message indicates that this is probably a Group Policy setting.
Try this to open the Control Panel...
Start | Run | Type: control | OK
If XP Pro...
Open Group Policy...
Start | Run | Type: gpedit.msc | OK |
Navigate to >>>
User Configuration\Administrative Templates\Control Panel\
Prohibit access to the Control Panel
Set to Not Configured.
Also check these settings...
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explor
er]
"NoControlPanel"=dword:00000000
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explo
rer]
"NoControlPanel"=dword:00000000
===
Control Panel stops responding in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;843551
Also if you have TweakUI...
TweakUI
Control Panel
Make sure that all the boxes have check marks.