Came across this error “This setup requires Administrator privileges for configuring IIS Virtual Roots.” when attempting to install some software on a work development machine. Although I had admin rights and all permissions to install this app it failed with the above error.

To save on time getting support to sort it all out (and obviously should not be done if you don’t have the permission to do this) found that I could alter a registry setting the DisableUserInstalls value to 0 in HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer.