Thanks, PPP.
No way would it work with Firefox, but I enabled IE7 and that seemed happy to run it.
It's been running for half an hour now, with no messages of any kind other than that my Internet connection is very slow (it's ADSLmax and usually achieves around 5.5meg from here).
Summat's adrift, clearly. It'll be interesting to see what it comes up with after all this faffing about
