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Problems With C++ Inline SSE Assembly In Member Functions Using Visual Studio 2005

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I have a class, vec4, delared as follows:
class vec4
       {
        public:
		__declspec(align(16))
		union
		{
			struct
			{
				float x,y,z,w;
			};
			float data_[4];
		};
        //Constructor
        vec4();
		vec4(const vec4& src);
		vec4(const float val);
		vec4(float nx, float ny, float nz, float nw);
		vec4(const vec3& v3, float nw);
         const float norm();
        ~vec4();
       };

and in vec4::norm i have the assembly line: movaps xmm0, [this]vec4.data_; and it does NOT move data_ into xmm0. it doesn't crash either (in debug mode. sometimes crashes in release). now, how can i move the 4-float (ps) vector into xmm0??? TIA and in a

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