After unregistering the instance, can you see the counters in perfmon?
Here's a KB article that discusses SQLNS performance counters; not
exactly the problem you're describing but maybe it'll help.
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On Wed, 15 Mar 2006 21:09:15 +0530, "Gouri" <[email protected]>
>I did un-register the instance. Later when I re-register it gives error that
>performance counter already exists.
>"Joe Webb" <[email protected]> wrote in message
>> Did you unregister the instance before re-registering?
>> Joe Webb
>> SQL Server MVP
>> Get up to speed quickly with SQLNS
>> I support PASS, the Professional Association for SQL Server.
>> On Sat, 11 Mar 2006 14:02:38 +0530, "Gouri" <[email protected]>
>>>If for some reason the notification instance is to be re-registed, it
>>>error that performance counter is already exiting. How to overcome this?