Thanks CBA, I tried all that and now I'm getting a "Socket Error 10061" which according to the interweb could be a Firewall problem but this is now getting way above my limited knowledge. I don't want to start turning things off when I don't really know what I'm doing!
I can send and receive emails from my Yahoo account on the laptop but not with WLM, so is this a client problem?
I'm running Comodo Internet Security Suite in safe mode if that makes a difference.
Thanks again.