The op system is Vista 32 bit. The message is that an error has occurred which prevents the update being installed - refer to administrator in case the update is blocked. I am the administrator and no such block is applied.
Thanks for your interest
Please see Troubleshoot AIR installation | Windows - http://helpx.adobe.com/air/kb/troubleshoot-air-installation-windows.ht ml for information on how to resolve your difficulties with Adobe AIR.