error when installing sql server 2008 express on a virtual machine

Hello good morning a question create a virtual machine with windows 7 to use sql 2008 express but when installing I frame the following error:

  

"The MOF compiler could not connect to the WMI server.   may be due to a semantic error as an incompatibility with the   WMI repository or to a real error such as that the   WMI server ".

Someone who guides me please already do several things but remains the same.

Thanks