I just bought the game like three days ago. I went on to play and it was talking about not having enough memory. I tried the solutions it suggested for me but nothing worked. Now when I try to play, I'll click the play button then it'll show the Mojang thing and just stay there. If I click at all it starts saying "(not responding)". The day before I had downloaded two texture packs and changed my skin, but I was able to run the game without incident shortly after these changes.
Any assistance is greatly appreciated!