Hyper-V failing to initialize

Apoligies if in the wrong section.

Testing out vWorkspace and have run up a test Hyper-v box and joined it to a test domain we have.

Run up 2 VMs(both joined to same domain), one a 2008 R2 thats used as the connection broker and the 2nd a Win7 machine that will be the test desktops.

Installed the connection broker and am trying to initialise the Hyper V machine but keep getting the below error:

Hyper-V Catalyst Components install: Failed to remotely logon to the computer. The specified username is invalid. (2202) retry will occur automatically if necessary.

Right clicking on the name of the hyper-v machine in Locations>Location1>Virtualization Hosts>Hyper i can test the connection tot he hyper-V and it passes.

In the log tab it says:

Started Initialize Computer host action.

Thent he next line says "Hyper-V Catalyst Components are not responding or don't exist"

Any suggestions?