This is a new WIndows Home Server 64-bit installation, of which I remember exactly what my Administrator password was set to, and I could connect to the server from dashboards on other machines. I did a load of Windows updates, which required a reboot,
unfortuneately I think this was the first proper reboot since setting up the machine. I get the Adminsitrator loging screen, I tryped in exactly what I knew was the password that was working previously. Incorrect yadda yadda yadda. I'm now
re-installing the whole thing again from scratch, just in case I did make a mistake.
If anyone has experienced this and know what to avoid look out for fix the problem. Please let me know.