I haven't seen an out of memory error since the days of DOS-based Windows and 128MB standard RAM.
If a RAM stick had failed or become unseated, surely it would have thrown up a BSOD?
System specs would help - how much installed RAM do you have?
(I'm going to have a stab at there being no actual physical memory problem, just a random .exe crash that's thrown up an OOM error for other reasons.)
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