Any Audacity Experts out there?

I have run Audacity on a laptop and a PC (both running XP) for a number of years.In the past year I have bought a new laptop and a new PC (running Vista) and I have been unsuccessful in getting Auidacity to work on either. I have tried both the stable and beta versions.On both machines I either get a greyed out box where I should be selecting the input device (stable version) or an error message regarding the selection of the input device(beta version).On one version (can't5 remember whic) the programme closes pretty quickly with a windows has had to close this programme message.
I've no doubt it is a setting or something that I need to change on my machines but am having no luck with it.
Can anybody help me out?
Thanks!

Actually, I have just worked it out for myself :)

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