WCF Activation HTTP-Non HTTP Activation fails with Fatal error 0x80070643

Last night while preparing a Windows Server 2008 for the evaluation of SharePoint Server 2010 beta, I've installed all the prerequisites of SharePoint 2010, installed the roles, beta preview binaries and some hotfixes etc. I just wanted evaluate .NET 4.0 beta 1 along with SharePoint 2010.

While adding the features for my server such as .NET Framework 3.0, WCF activation, Window process activation service and desktop experience. Except WCF activation everything wen t smooth. My Server restarted dozen times saying "Configuring updates were failed reverting changes".

After sometime go-ogling the web resulted in the following Microsoft Connect article saying that the .NET Framework 4.0 is the culprit and uninstalling this will resolve the issue. But no luck even after uninstalling .NET Framework 4.0 and .NET 3.5 SP1.

At last I've uninstalled all the prerequisites of SharePoint 2010 related hotfixes, CTP's and beta previews. Now the WCF Activation feature installed like a breeze and finally succeeded in setting up my evaluation copy.

But a beta binary set installation which blocks a Server feature installation is not so good and as usual Microsoft doesn't provide any useful reasonable error message. Moral of the story is build is your box in a clean slate, Add roles and features required to the server and the add up your hot fixes,CTP's and betas.

Hope it helps some one