Hi John -
This is currently a known issue,
http://forum.ncrunch.net...dy-uninstalled-too.aspx
.. And a bit of a pain in the neck. I'm hoping to have it fixed soon.
It should be possible to trick the NCrunch installer into thinking that VS is still installed by copying a dummy .exe file of some kind to:
C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe
.. then adding the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\11.0\InstallDir = C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE