Thanks for your reply Darius and thanks for the link.
I found this discussion helpful also - http://communities.vmware.com/message/2111967 - Seems some Z77 boards have VT-d.
I shall purchase a new board, probably a Z77, and see what the results are when I swap my current one. If it works great - If not then I'll work slowly towards a new build.
Thanks again,
Karl