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I found the answer: I needed a shorter directory name. I suspected that earlier, but when I got rid of the CreateDirectory thing and forced a short name like "gloop" on the tag end of Temp, it still didn't run. I thought sure I was short...
I tried moving away from something so purely symbolic as in the formulation of your problem. That is why you will see that I moved away from Integrate to NIntegrate when I reformulated your problem. I also moved away from the default method which is...
The next thing you need to do, aside from supplying numerical values to your variables, is to give your rule a name. Let's just call it ruel for now:[mcode]In[5]:= ruel = DSolve[{Derivative[2][Subscript[u, 0, 0]][y] +      ...