Enabling DCOM of a Vista or Server 2008 computer

Windows Management Instrumentation (WMI) uses DCOM to communicate with monitored target computers. Therefore, for enable WMI, DCOM must be enabled and properly configured.
To enable DCOM permissions for your credentials:
1. Log on to the computer you want to monitor with an administrator account.
2. Navigate to Start > Control Panel > Administrative Tools > Component Services. You need to switch to the Classic View of the Control Panel to use this navigation path. (You can also launch this console by double-clicking comexp.msc in the /windows/system32 directory. Configuring WMI on Windows Vista and Windows Server 2008 for your requirment.
3. Expand Component Services > Computers.
4. Right-click My Computer, and then select Properties.
5. Select the COM Security tab, and then click Edit Limits in the Access Permissions grouping.
6. Ensure the user account you want to use to collect WMI statistics has Local Access and Remote Access, and then click OK.
7. Click Edit Default, and then ensure the user account you want to use to collect WMI statistics has Local Access and Remote Access,
8. Click OK.
9. Click Edit Limits in the Launch and Activation Permissions grouping.
10. Ensure the user account you want to use to collect WMI statistics has Local Launch, Remote Launch, Local Activation, and Remote Activation, and then click OK.
11. Click Edit Default, and then ensure the user account you want to use to collect WMI statistics Local Launch, Remote Launch, Local Activation, and Remote Activation.
12. Click OK.