UPDATE: The below information was once thought to enable Flash in 64-bit browsers, but after further analysis it appears that there is currently no method to get Flash working in a 64-bit browser. Below is the original article, but we will update it once we find a fix that works 100 percent. Your only options are to wait for a 64-bit version of Flash, or run a 32-bit browser.
We are at a weird crossroads of technology. On one hand, common users are starting to need 4 gigabytes of RAM (read how to enable it in Vista), and on the other 64-bit operating systems are struggling for compatibility. Microsoft has tried to steer the industry into the 64-bit era by making the 64-bit version of Vista as seamless as the x86 version. Unfortunately, the rest of the computer industry hasn’t gotten the memo, so there are plenty of drivers and other software that just don’t plain work right on Vista x64.
For example, 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.
For Vista (32 bit):
For Vista x64: