Thank you Esmi. I emailed my host who gave the following response:
“Apologies, a minor error causing an older version of the WordPress software to be available via our Site Software installer has been corrected, this will now correctly install version 3.0.4.”
I uninstalled the old version and now v3.0.4 is working fine with 4 themes that I am trying. The original themes seemed to have vanished (clssic & default), but I don’t think that will be a problem.
My first problem solved!