OME install fails on publishing IIS, ASP.Net error

Hi,

I'm trying to install OME on my R200 server, Dual core Xeon, 8GB RAM, 1TB HD and right at the end when it tries to publish the IIS essentials app it stops and uninstalls everything.

This is what the install log is showing:

Beginning Dell-SystemsEssentials-Catalog-Values.sql at 2012-10-26 21:28:40 ....
Deleting the Values...
Inserting the Values...
Website unzip complete.
Completed Dell-SystemsEssentials-Catalog-Values.sql at 2012-10-26 21:28:45 ....

RemoveWindowsGroups(...)

Website install started...
Undefined exception occurred:
System.InvalidOperationException: Asp.net is configured incorrectly and may need to be reinstalled.
Unable to locate the ISAPI configuration elements using these keys:
v4.0., aspnet_isapi.dll, Microsoft.NET, C:\Windows
   at InstallUtil.Installers.Website.UpdateWebToUseISAPI()
   at InstallUtil.Installers.Website.Install()
   at InstallUtil.Program.RunInstall(CommandLineArgumentsDictionary arguments)
   at InstallUtil.Program.Main(String[] args)

2012-10-26 02:28:45 PM
"D:\Program Files (x86)\Dell\SysMgt\Essentials\bin\WebInstall\InstallUtil.exe" -u

Uninstall()

RemoveWindowsGroups(...)

Deleting Database [OMEssentials]

RemoveRegistryKeys()

Website un-install started...
Website un-install completed.

I tried changing the default app pool to .net 4.0 to see if that helped and it didn't make any difference.

Thanks