Exchange 2013 unistall hangs stopping service MSExchangeIS

I need to perform a full uninstall of Exchange server 2013 - It was just installed on an incorrect machine (ooops).

I have tried the GUI but after a few hours I have decided that it seems to hang at 11% no matter what.

Using

setup.exe /mode:Uninstall

I get a little more feedback but the setup still hangs at 11%. Looking into the logs I see that it hangs here:

25.06.2014 16:38:22:stop-SetupService -ServiceName MSExchangeIS -MaximumWaitTime "unlimited"

This never completes. Sure enough, looking into the services.msc I see that said service is still "starting".

Using process explorer I can kill the process but it is immediately re-created and stay in "starting" state.

What would be my next option here !?