You can get far without spending any money on development software.
Concerning PIX: read here. Luckily I was warned by that thread then and blocked that update. Hopefully you can uninstall (if that's actually the issue and solves it ;)
Debug output will only happen when you have used D3D11_CREATE_DEVICE_DEBUG at device creation (not entirely correct: The control panel lets you select apps explicitly, but I never used that, so I can't comment on that).
That thread made me finally look into alternative GPU debuggers: The only one that worked for me was Intel's GPA Frame analyzer (works great for my NVidia and is the only one apart from PIX that works with my C# stuff). NVidia and AMD have "their" debuggers, too (NSight, GPUPerfStudio).
Good luck. Shaders are fun, especially with D3D11.
Edit: Important: I'm still using VS Express 2010 and Win7 so use my uninstall-approach at your own risk.