How do I properly check if a particular OpenGL version is available?

I can't find any information on glCreateContextAttribsARB returning errors if a version is unsuported by the driver. So how do i check if it is? I don't want the program to hard crash because glCreateContextAttribsARB failed and i had no chance to check why it did.

Here's my code, i try to keep it minimalistic, the OpenGLVersion uses the glGetIntegerv to get the major and minor didgits and creates a number out of it. It checks if the version is 'least 3.3, though i've no idea if this actually does anything unless i set up glCreateContextAttribsARB with the wrong numbers.

So when does OpenGL "get a version", so that the glGetIntegerv returns a valid information? Is it something built in or does it return something valid only after i set up the context? How do i check if the OpenGL version i want to use is supported?

void CreateOpenGLContext(HWND hWnd){

    //Set the pixel format

    PIXELFORMATDESCRIPTOR pfd =
    {
        sizeof(PIXELFORMATDESCRIPTOR),
        1,
        PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
        PFD_TYPE_RGBA,
        32,
        0, 0, 0, 0, 0, 0,
        0,
        0,
        0,
        0, 0, 0, 0,
        24,
        8,
        0,
        PFD_MAIN_PLANE,
        0,
        0, 0, 0
    };

    hDC = GetDC( hWnd );
    GLuint PixelFormat = ChoosePixelFormat( hDC, &pfd );
    SetPixelFormat( hDC, PixelFormat, &pfd );

    //Create an OpenGL context to get access to the WGL extensions

    hRC = wglCreateContext( hDC );
    wglMakeCurrent( hDC, hRC );

    //Load functions

    if(glload::LoadFunctions() == glload::LS_LOAD_FAILED){
        MessageBox( NULL, TEXT("Failed to load OpenGL extensions."), TEXT("Error"), MB_OK | MB_ICONEXCLAMATION );
        PostQuitMessage(0);
    }

    //Load WGL extensions

    if(glload::LoadWinFunctions(hDC) == glload::LS_LOAD_FAILED){
        MessageBox( NULL, TEXT("Failed to load WGL extensions."), TEXT("Error"), MB_OK | MB_ICONEXCLAMATION );
        PostQuitMessage(0);
    }

    //Use WGL extensions to create an OpenGL 3.3 context

    const int contextAttributes[] =
    {
        WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
        WGL_CONTEXT_MINOR_VERSION_ARB, 3,
        WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
        0
    };

    HGLRC hRC3 = wglCreateContextAttribsARB( hDC, hRC, contextAttributes);

    wglMakeCurrent( hDC, hRC3 );
    wglDeleteContext( hRC );
    hRC = hRC3;

    //Check if the system supports OpenGL version 3.3

    if(OpenGLVersion() < 33){
        MessageBox( NULL, TEXT("Your system doesn't support OpenGL version 3.3"), TEXT("Error"), MB_OK | MB_ICONEXCLAMATION );
        PostQuitMessage(0);
    }
}