One of the requirements for AGS 10.5.1 is Microsoft Core XML Services (MSXML) 6.
How does one verify that this piece of software has been installed on the server? Should there be an entry for this item in Programs and Features in the Control Panel?
If the ArcGIS Server installation is performed through the GUI, the installation process automatically installs it for you.
Another easy way to detect the version of MSXML is through Registry Editor.
Navigate to the following path in Registry Editor (regedit.exe)
Thank you very much Jayanta. It would be much better if the installation of a component such as Microsoft Core XML Services (MSXML) 6 can be verified by looking in Control Panel->Programs, though, as that is much more intuitive than your link or searching through the Registry.