A pagefile is not absolutely necessary although some applications may not work correctly if it can't page anything. I think Java is one of them. So whatever you put in is fine and usually 1.5 times the physical is norm. It used to be physical memory + 12 in the NT 4/2000 days.

Regardless whether the memory test come through, you should also look into making sure you have the latest drivers for all your hardware and also make sure Windows is updated.