As far as I know, your comp cant handle it.

I use a old comp for rendering and have the same problem on some renders.
Especialy on complex renders with lots of details, AO, reflections etc.
To avoid it you can eather lower the render quality or render in layers.

I usualy render in layers or parts and put them together in a paint program.

I am not a complete idiot, some parts are missing :)

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