Access to the registry key 'Global' is denied

While giving permissions to the 'defaultAppPool' user I am getting the message 'There is no such global user or group: DefaultAppPool.' Can anyone help me here! However, using command 'net localgroup "Performance Monitor Users" DefaultAppPool /add' I am able to resolve the error but i am facing this problem in 开发者_StackOverflow社区Windows Server 2003/IIS 6.0. Here, I am always prompted as 'There is no such global user or group: DefaultAppPool.' I have also added the 'Network Service' but no avail.

You have to add the user that your DefaultAppPool is configured to use. Check the Identity of your DefaultAppPool and add that to the Performance Monitor Users group.

Now, I can't say that correctly adding the user to the group will fix your real issue. I am getting the same error with performance counters even through my app pool users have been added to this group.