EB taxes your system a lot more than vanilla does, so the vanilla test doesn't cut it I'm afraid. As you've experimented with various video drivers, have you also checked your memory? That's a common cause of random crashes. Run Memtest overnight to verify that your chips are fine (google it).
BTW, what Maion said about increasing virtual memory might help too; RTW leaks memory and the problem will happen sooner when you don't have enough of this. Go to the control panel => system => advanced => performance ("Settings") => Advanced => Virtual Memory ("Change"), and increase the size.
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