Hmm - more problems. The Bit Defender website doesn't show that Vista is supported but I went for the download anyway. The first effort looked promising as I was told that the scanner was downloading. However, after an hours and 10 minutes watching red blocks file across the screen, I decided to abort the process and have another go. Although on the first attempt it appeared to let me install the ActiveX control on trying for a second time I'm now getting an error "This website is not authorized to host this ActiveX control. Please contact the webmaster or report to BitDefender at the e-mail address:
scanonline@bitdefender.com" - which I have now done.
I'll have another go to see if anything changes. Broadband signal is very good so don't think that it's a connection problem.