OME Installation Failure

I'm having trouble installing OME, and hope someone can help.

I'm installing the latest OME on one of our test machines, which is currently not connected to a network.

Installing prerequisites goes without a hitch, but the OME install itself fails without a reason given.

The InstallUtil log gives the following errors repeated from each attempt:

2015-10-07 05:25:43 PM "C:\Program Files (x86)\Dell\SysMgt\Essentials\bin\WebInstall\InstallUtil.exe"  -DatabaseOptions 8 -i -WebsitePath "C:\Program Files (x86)\Dell\SysMgt\Essentials\WWWRoot\Essentials" -WebsitePort "2607" Website unzip started... Website un-install started... Undefined exception occurred: System.Net.Sockets.SocketException (0x80004005): The requested name is valid, but no data of the requested type was found    at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)    at System.Net.Dns.GetHostEntry(String hostNameOrAddress)    at InstallUtil.Installers.Website.get_IssuedToCertificateInfo()    at InstallUtil.Installers.Website.Uninstall()    at InstallUtil.Installers.Website.UnzipAsync()    at InstallUtil.Program.RunInstall(CommandLineArgumentsDictionary arguments)    at InstallUtil.Program.Main(String[] args) 2015-10-07 05:25:43 PM "C:\Program Files (x86)\Dell\SysMgt\Essentials\bin\WebInstall\InstallUtil.exe" -u Website un-install started... Undefined exception occurred: System.Net.Sockets.SocketException (0x80004005): The requested name is valid, but no data of the requested type was found    at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)    at System.Net.Dns.GetHostEntry(String hostNameOrAddress)    at InstallUtil.Installers.Website.get_IssuedToCertificateInfo()    at InstallUtil.Installers.Website.Uninstall()    at InstallUtil.Program.RunUninstall(CommandLineArgumentsDictionary arguments)    at InstallUtil.Program.Main(String[] args)

I'm not sure where this error comes from - can anyone help?