Newman –
The ‘Access Denied’ issue is caused by a problem with your permissions. Please see the following link for more information on resolving: BatchPatch Authentication in Domain and Workgroup (non-domain) Environments
The ‘Invalid namespace’ error generally indicates that WMI on the target computer is broken or corrupt in some way or another. Start with rebooting that target machine. Sometimes that’s all it takes to fix. If that doesn’t work, I would recommend doing some googling to troubleshoot WMI corruption and/or invalid namespace errors. A good starting point is here: http://blogs.technet.com/b/askperf/archive/2009/04/13/wmi-rebuilding-the-wmi-repository.aspx
I hope this helps.
Thanks,
Doug