hyper-v-worker event id 10044

I’m trying to setup a Server 2008 r2 test environment. I have setup a virtual machine but it will not start. I get below event error and this:

Log Name:     Microsoft-Windows-Hyper-V-Worker-Admin

Source:       Microsoft-Windows-Hyper-V-Worker

Date:         1/01/2014 5:12:49 p.m.

Event ID:     10044

Task Category: None

Level:        Error

Keywords:     

User:         NT VIRTUAL MACHINE\9F176CD8-D32D-4932-AA4A-C7717CA4419A

Computer:     PC.DOMAIN.local

Description:

The Virtual Machine Worker Process has lost its connection to the root\virtualization WMI namespace: General access denied error (0x80070005). As a result, some WMI operations may not function correctly. To correct the problem, try restarting the Windows Management Instrumentation service.

I have checked that WMI is started and I have also restarted the computer.

Thanks for the help.