Cannot install new instance SQL 2005. WMI Error

Hi,
Currently I have a problem installing a second instance on the SQL 2005 server. There is an error that says:
Cannot connect to WMI provider. You do not have permission or the server is unreachable. Note that you can only Manage SQL 2005 servers with SQL Server Configuration Manager. Invalid Class [0x80041010]

Do I need to disable the WMI Performance Adapter? It appears that the problem begun snce we enabled this service.

Thanks for your help
andresskAsked:
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Daniel_PLDB Expert/ArchitectCommented:
Have you tried?:

start->run->cmd

mofcomp "C:\Program Files\Microsoft SQL Server\90\Shared\sqlmgmproviderxpsp2up.mof"
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andresskAuthor Commented:
Hi thanks for your help. I'm testing the command in a production environment, so I have to wait for an authorization. I'll let you know about the results.

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Daniel_PLDB Expert/ArchitectCommented:
If this is 64 bit installation you ned to use program files (x86)
mofcomp "C:\Program Files (x86)\Microsoft SQL Server\90\Shared\sqlmgmproviderxpsp2up.mof"
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Microsoft SQL Server 2005

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