Compositing big images: blender compositor crashes

Hello everyones, as the title says im facing a memory problem with the compositor. I’ve rendered a quite big image (something like 7000x4000) with cycles because ineed it to print a poster and iv’e saved it as an open EXR file with layers.

When i put it in the Blender compositor for some post production, the software crashes. No metter if the operations i do are very simple, it just crashes; it crashes even with a simple resize node.

You can tell me i haven’t enough memory to perform postprocessing on my machine but, at the moment, i have 32 gb of ram istalled so, this issue sounds to me a bit strange.

Anyone has any advice to composite and postproduct big images with Blender?

Thanks in advance

Kind regards

P.S.: just if someone need this information, the pc i’m using is an intel i7 3770K with 32 GB of ram and the GPU is a nVidia gtx 660 TI with 2 GB of memory. The OS is Windows 7 64 bit