Okay it's going to get a little scary if you don't like the command line but lets try something... You should have a program: VS2012 x86 Native Tools Command Prompt. Under Microsoft Visual Studio 2012 -> tools, not entirely sure where it is on Win8 but if you search for VS2012 it should come up.
Should open something like:
Code:
C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC>
Run the cl command with /? as an argument, eg:
Code:
C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC>cl /?
That should bring up a lot of info and a lot of hit enter to continue screens. As well as starting off with something like...
Code:
Microsoft (R) C/C++ Optimizing Compiler Version 17.00.51106.1 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
If it doesn't you need to reinstall VS.
If it's installed correctly try instead:
Code:
C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC>cmake-gui
That will launch the cmake gui with all the VC Vars set and hopefully it will be able to find it.