I think i had been doing too much at once.
I may have changed the computer name between installation and running the service
Using appwiz.cpl i uninstalled MP, then i uninstalled TV-server
i left sql and the other bits
then i installed it and this time when i ran the tv server config it gave me the psisdecd warning
so i fixed that by reading this post
fix for psisdecd
then i ran the tv server config and it appears to be working (it's canned and found 37 channels, yay!)
thanks for your help