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Start Adobe Acrobat and execute Help > Activation > Activate...
>Acrobat Standard 8.0.0
I am not 100% sure about this, but I think Acrobat won't work properly under Vista until you apply updates
Do the updates in number order!
John's suggestion of updating sorted out the issue. Thanks for the replies.
Vista works with Acrobat 8.1.3 and higher versions. I recommend that you install the updates.