I have written several posts on Adobe CS4 installation problems and how I finally managed to install the parts that I needed. At that time, the problem always happened as the installation software attempted to install Adobe Air and/or an Air application. One part of my solution was to skip installing Adobe Air. Since then, on multiple occasions, I tried installing Air applications which always, without exception, ended up my computer being rebooted. Every so often I would get curious enough and would have enough time to spend on this issue and search, experiment, and fail again.
Today on Adobe forums I stumbled upon several posts that mentioned the application “Folder Lock” being a problem. I had that installed at one time on my computer, I had uninstalled it way before the CS4 installation problems. But I was able to find the file mentioned in the forums and removed it. That did not solve the problem. Then, I reinstalled Folder Lock and uninstalled it using its specific method once more. Lo and behold! I could install Air applications! Not that they are earth-shatteringly necessary or useful, but it brought a sense of closure, at least at a personal level, to my ongoing battle with the Adobe installation problems.
Now, clearly, Folder Lock appears to be an obstacle for Air applications to install. Shame on Folder Lock. That said, why on earth Air application installers, or Air program itself not designed, or corrected to trap this problem and give a meaningful error message instead of crashing the computer. Another point that is still very problematic is the advice given by Adobe tech support. They insisted that I should uninstall all Adobe products. Had I listened to them, uninstalling Adobe software would not help my problem. As guilty as Folder Lock, or similar software may be, Adobe and its tech support provide good company with it.