Last month I bought a copy of personal finance software from the company recently propose to buy Yahoo. The activation did not work. There is no response when I press any button in the activation dialog box. A google search showed others have seen this on Vista, and it was possibly caused by the security mechanism. Disabling the security did not work for me, and I have to give up until I saw similar failure when I install Abode Reader. No response during the license dialog. A post at Abode forum suggest register vbscript and jscript again. It works.

Lesson: I might have jumped too early for Vista. Upgrade might not mean the definitions you would find in a dictionary.