Thanks Sebastian... starting to really point me in the right direction!
I did change the machinekey (& I think from the top of my head the device key) to the new computer... it does see the site, but I am starting to think one of these keys should not be changed?
Cookies... I am not sure but switching back to the SQL Server database (rather than SQL Express I am trying to link to instead) I am not having any problems.
I didn't have the installer itself show up, but will check over the keys again. Thinking now one of them should not have been changed.
Thanks