Another detail that could help:
.airinstall.log only says "ECHO is active"
Sorry, one more detail:
I'm using Sysinternal's Process Explorer. It has a feature to bring an application window to front, but it says "No visible windows found for this process". Any of the two AdobeAIRInstaller.exe running can't show any window or message.
The installer/uninstaller don't display any error message. It just stay frozen.
Could you uninstall AIR by the Uninstall Program control panel?
Unfortunately, no. It freeze the same way as installing ou uninstalling via "-uninstall".
Try using Microsoft's free "Windows Install Clean-Up" utility. It's the only thing that allowed me to uninstall Adobe AIR after it had somehow become corrupted.
Run that, then select any entries for "Adobe AIR" in the list of programs (I had two entries in my list), and remove them. That should fix it!
To download, visit http://support.microsoft.com/kb/290301, then scroll down till you see download link.
Hope that helps!
P.S. Someone else suggested to find Adobe Integrated Runtime in the installer clean up list and to click remove that. Personally, I didn't see Integrated Runtime in the installer clean up list. For me, the problem was fixed by just removing the Adobe AIR entries.