Hello fellow stuck people, I thought I would respond and let you know that I got vpn up and running.
I had about 4 guides open at the same time, but ultimately worked through the zentyal official version. I used the names pretty much as provided in the guide for the user (myvpnuser), and server (vpnserver). Left all as default as I only need a vpn connection into my server to access shares and want to use my remote internet connection, not that of my server. VPN server address stayed as the default 192.168.160.0/24 as suggested.
Don't ask me why in the vpn/clients there are no clients listed, and the guide doesn't ask for it.
I didn't touch the advertise networks, left it all as default (my server has 2 interfaces, one internal and one external).
Finally with these settings, I clicked on download client bundle in the vpn servers tab. I used our registered server address "name".zentyal.me, and ticked to add the openvpn installer to the bundle for my windows machine. Clicked on download, and Openvpn actually downloaded within firefox (run/save etc). I extracted the zip file, installed the setup, ignored the warnings from Win7. Then copied the certificates provided in the zip file to the config folder of c:/program files (x86)/openvpn/config. Then when I went to the start button of windows there was a bolded "generate a static OpenVPN key" tab which I clicked on and a key was copied also into the config folder of openvpn.
Then I ran openvpn. It logged in and provided an assigned IP of 192.168.160.2 (server is pingable on 192.168.160.1 (and in firefox I can log into the server with https:/192.168.160.1), and I am not sure what is operating on 192.168.160.0 as that is its VPN address, but I am leaving well alone.
Then once logged in I could map a network drive as I normally would if I had been internal.
I hope this provides some info to the other dummies out there, none of the zentyal heros or techies bothered to respond
, they were probably smart enough to know that I would either figure it out or go away. But it is a free software, volunteer forum etc and no blame, so I hope this helps someone in turn. Phew