Thankyou for the reply. I am pleased to hear that you have had success. Unfortunately I still cannot get the application to start up. I have ensured that I am logged in as administrator and have uninstalled, downloaded and reinstalled the application three times but still it will not run. I have Windows 8.1 running in 64 bit, but I don't think that it is the Pro version. Perhaps that is the answer. I also suspect that it might have something to do with the .NET Framework versions. The Zoom site only mentions version 1.1, but this is not available under Windows 8.1.
I have also tried the Run As Administrator and the XP compatibility settings, but again with no success.
Any further help or advice would be appreciated.