Failed to initialize all WMI classes

Suddenly all WMI related functions don't work anymore.

When I go to Computer Management > Services and Application > WMI Control

and then ask for the properties of this WMI Control I get the message:

Failed to initialize all required WMI classes.

Win32_Processor: Win32: Access denied

Win32_WMISetting: Successfull

Security information: Successful

Win32_operatingSystem: Win32: Access Dienied

Anyone an idea who to fix this problem?

Kind Regards,

Arthur Kater

PlazaLOGIC

p.s. Using Google I found tons of people with this problem, but no-one with

a solution...