I recently upgraded my motherboard and processor, and with it I purchased two 512mb sticks of pc3200 ddr ram. Yesterday, I went out and purchased another two sticks of 512mb pc3200 ddr ram. My pc registered the new ram, and loaded and worked properly. I played a game for a while, then shut it off and went to bed. I turned it on this morning and it now locks at 'different' points at the windows xp login screen. By different I mean it might crash as soon as it loads, after I klick my account to enter the password, after I enter the password, or as it says "loading your personal settings". By crash I mean the pc locks and will not proceed, the mouse pointer will still move however. This happens even after removing the two new sticks of memory. Windows will however load without trouble with all four sticks if I load it in safe mode. What exactly happened here?