Can you check if you have a registry key at:
If you're on a 64-bit machine it'll be at:
That's what we look at to make sure VS is installed. Also - this is w/ RC1 of the tools? And you're getting the error message when you run the PythonToolsInstaller.msi?
Can you also go to Help->About VS and post the list of installed extensions? It actually sounds like you have PTVS installed w/o the IronPython support (if you had IpyTools installed or if you had PTVS w/ IronPython support I'd expect to see IronPython
templates). And is Python Tools still listed in add/remove programs?