Steel, what is the size of render you are trying for 800x600 for example. Maybe you should reduce the size of render also, especially since you have such little ram 512.  I'm out of town and I also do not have my pc with me so I can't help you till I get back to Vegas, and that won't be till next Sunday.  I also think that maybe you coould remove some of your petals and make more room for that tree of yours, I wouldn't hurt the scene at all.  Catch you later my friend Linda