A quick post, as much for next time (if there is one) in case I forget.

I created a new Virtual Machine in Hyper-v and installed Windows Server 2003 Standard but after the reboot I had no network connection despite setting it up to connect to my internal network.

I tried re-adding the network adapter in Hyper-v and rebooting which  didnt work so I checked Device Manager which displayed No Device

To fix this, I downloaded and installed Windows Server 2003 SP2 and then installed Integration Services from the Action Menu of the Hyper-V Virtual Machine Connection.

Then after a reboot I had a network adapter