After uninstalling SCCM tp3 “successfully,” System Center Configuration Manager TP4 refuses to install

So, I uninstalled System Center Configuration Manager Technical Preview 3 last night. The uninstaller said it was successful, however when attempting to install the newest technical preview on the same machine, I was met with the following failures:

  1. Remote Differential Compression is needed, Well, this is already installed and has never been a problem before on this machine.
  2. Previous components are still installed from an earlier installation of System Center Configuration Manager.
    Really?, the uninstaller said it was able to uninstall everything, I even went into the registry and deleted anything related to SMS or SCCM tp3.

So, this was of course very annoying and I spent a couple hours trying to solve this problem, by reading the logs, and hunting through the registry, but after searching the web I found posts that suggested starting the RemoteRegistry service, and although I had it set to start automatically, it must have not started itself, so I just went and started it, now I am installing.
Update: even after starting the remoteregistry service install still is stuck with the same two prereqchk errors

this is still not solved…

System Center Configuration Manager Technical Preview 4 Available Now

System Center Configuration Manger

You can download the latest preview of System Center Configuration Manager and Endpoint Protection now from the Technet Evaluation Center. I have not seen any posts or documentation detailing anything specific to the 4th preview, so it must have just been released. Hopefully they have fixed a bug that I have found in the 3rd T.P. where the application catalog and the application catalog web service roles will not install because of a IIS version check error. I have been getting the error that IIS version 7 or above must be installed, however version 10 is installed along with all of the required prerequisites, so I am about to install it and check what has changed in this new preview version.

As with the other technical preview versions of configuration manager, this preview is also only good for 60 days, and upgrades are not supported, (which is annoying if you have been using the 3rd technical preview. I am going to have to uninstall the TP 3 before installing the 4th Technical preview.