It turned out that uninstalling AIR and reinstalling AIR was not enough. I had to do the uninstall / reinstall 3 times before Snitter would install. The problem appears to be one with AIR rather than with Snitter.
Jonathan has built a ton of cool features into the client and one of my favorite is the the ability to reply to a tweet, send a direct message to a tweets author or mark a tweet as a favorite just by mousing over the authors icon.
@MrBusinessGolf Get Snitter! You’ll like it, makes more sense
Jonathan has done a great job with Snitter and was very fast replying to me after I sent him an email whining that I couldn’t get Snitter to install.
Now I have one last request with regards to Snitter. When I click on a link I’d love it to open in my default browser as opposed to opening up in Internet Explorer.