http://blogs.technet.com/virtualworld/archive/2008/03/26/beta-4-5-application-virtualization-error-25120.aspxI pinged BoruRR internally about this a while back when discussions came up on the Application Virtualization Forum. One of the things that you should watch out for when installing Application Virtualization 4.5 on Windows Server 2008 is the IIS settings.en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/virtualworld/archive/2008/03/26/beta-4-5-application-virtualization-error-25120.aspx#3073579Wed, 18 Jun 2008 19:25:14 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3073579Joey Liang<p>I have comfirmed by two machine that &quot;IIS Management Scripts and Tools&quot; is also required to get rid of E25120. The item is checked in the picture but not mentioned.</p> http://blogs.technet.com/virtualworld/archive/2008/03/26/beta-4-5-application-virtualization-error-25120.aspx#3076018Sun, 22 Jun 2008 14:38:08 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3076018Justin Zarb<p>Thanks Joey, Your right for the RC build however the above was for the Beta! </p> <p>I will blog about all the bits you need to do to get it all up and running with the RC and win2k8 soon.</p> http://blogs.technet.com/virtualworld/archive/2008/03/26/beta-4-5-application-virtualization-error-25120.aspx#3134352Thu, 09 Oct 2008 02:48:49 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3134352Dale<p>Even with the final release, the above items mentioned are all required. Thanks! </p>