OCModshop tackles to problem that Adobe does not deliver Flash players for 64-bit Windows Vista.

Quote: "Adobe must really want their users to start using Microsoft's new Silverlight technology (a rich media technology similar to Flash). Adobe has recently released a new version of Flash, and yet there is no version for 64-bit browsers. That means that the person using Vista x64 either has to miss out on the latest websites, or they have to use a 32-bit version of Firefox. Trying to install Adobe onto Internet Explorer (32-bit or 64-bit) seems to work, but users are still met with the infamous "you need to install flash" message.
Here's how to successfully install Flash on the Vista (32-bit or 64-bit) so it works with all of your browsers."
Read the full report on OCModShop.