sorry for taking so long to get back to you - been away.
I tried your suggestions and I'm afraid they didn't work.
But with the help of Knowhow support we found the problem was due to interference by some programmes by Mindspark "My web search" and/or "Maps Galaxy Toolbar".
I've no idea how these came onto my PC, probably piggybacked onto some other application and I didn't un-tick an install option.
I appreciate you help and hope anyone else with this problem find the posting useful.