Firstly, The server could not be detected at all so I had to edit HOSTS file to add the following line:
192.168.0.21 ASPIREHOME
now the server is detected but I have the following problem:
I get to the screen where it says "Home Computer Wake Up"
"Do you want to automatically wake up this computer to back it up"
with a yes or no option..
It does not matter which option I choose YES or NO, - the Window freezes up then about 3-4 minutes later I get the following error message "An unknown network error has occurred.
Please verify that your network connection is active and that your Windows Home Server is powered on. Then restart this Wizard."
as an aside, I also put the server in DMZ mode in my router settings. 
any advice would be greatly apperciated!