[6c696e7578]

The C FAQ used to be a good place to start. Note, used to be:

http://c-faq.com/

What did you want to do on Windows? I think this depends as much on the compiler as the code.

[camgunz]

Second this. Read it all more than once; the insights it will give you into C are so valuable.

I'll also recommend C++ FQAs [1]. It's C++, yeah, but it's relevant to C in many places, and since a lot of systems programming now uses C++ as the lingua franca, it's a good, entertaining resource.

1: http://yosefk.com/c++fqa/