Hello, I need to install 2 web adapters, with different names on a machine running Windows Server 2012, it is also in my AD, but whenever you install the second, there is no option to install under a different name, just modify or remove the previous...
It may be worthwhile to restart the machine if you have not already. If that has already been done maybe you can try extracting the setup files to a different hard drive if you have one other than the C Drive. If that does not work then I would consider opening a case with Esri Technical Support and they can dive a bit deeper into your environment.
At this point I would recommend opening a Technical Support case so that an analyst can take a deeper dive into your environment to see what may be happening.
Here is the site when you can create a case: Esri Support Contact Support