I wasn't able to reproduce the issue in my environment. Please provide more details:
- Exact version of OS (you can find it by running "msinfo32")
- Language/Locale of your OS
Can you re-check the credential test for Node (Manage Nodes, select Node, go to properties, change the polling method to Windows Servers WMI and ICMP, test WMI credentials are OK).
The last think that comes into my mind is that Win WMI repository is corrupted (I saw this many times in different OS versions, it can be fixed easily. I can provide more info later).
O.