WMI Requirements

WMI remote installation method requires the following:

On the target computer, WMI must be enabled and started. It is enabled by default.

User account used for remote connection must have administrative privileges.

WMI connection must be allowed in the firewall on the target computer - it requires the port 135 to be enabled for DCOM (Distributed Component Object Model)  for incoming connections. Also, one of the ports above 1024 (usually 1026-1029) must be enabled.
Default Windows firewall can be configured by executing the following command on the target machine:
netsh firewall set service RemoteAdmin enable

Account for connecting to the remote computer should be a domain account and must have local Adminstrator privileges.
WMI can also be used if the account is a local account, but on the remote system User Account Control (UAC) should be disabled.

For more information see http://msdn.microsoft.com/en-us/library/aa826699%28v=vs.85%29.aspx