Hi,
This issue is generally observed if you are trying to uninstall as a standard or power user. It could be the case that you do not have the complete permissions as administrator. Could you help me with the registry entry value so that we can help you better. For the same go to run(Windows+r keys) and type regedit. Registry editor will open. Go to HKEY_LOCAL_MACHINE\Sofware\Policies\Microsoft\Windows\Installer and see if DisableMSI entry is present.
Also ensure that there is a single instance of Adobe AIR installer/uninstaller running on your machine.
Thanks!
