EventID 2001 after SP1 install

Hi.

After upgrading to SP1 for Exchange 2013, I keep getting this error:

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A transient failure has occurred. The problem may resolve itself in a while. The service will retry in 00:00:15. Message:

Filename:
Error: Cannot add duplicate collection entry of type 'add' with unique key attribute 'path' set to 'C:\Windows\System32\RpcProxy\RpcProxy.dll'

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'It does not seem to be causing any problems, but it is annoying to have this error log every 15 seconds.

Unfortunately I do not know anything about IIS, but it seems to be where problems is.

Anybody know how to fix this?

Regards

Jens Hyllegaard