I have also had No Problems opening it with a 3.2 GHz DualCore or 3GHz Core2Extreme E8400. My render times are different then your alls times as I put some of Forester's Old Wood Pines in the scene with extra flowers and cranked Everything up to Excellent, 4, or 100 percent Quality and you think the scene looks goods at it's default, WOW, it is many times better at higher settings and I don't mind waiting for the extra quality.

I would rather be Politically Incorrect,
Then have Politically Correct-Incorrectness!!!