Hi Liza. My initial thoughts on this one are that either the computer is overheating or the hard drive is getting full of accumulated debris. When the computer crashes can it be restarted immediately or does it need to be left a while. You say that there is 13G space, is this the total hard drive capacity, or is this the available space on a larger drive - if it is, what is the total drive capacity. The computer is 7 years old, has Windows been reinstalled in this time and do you feel up to reformatting and reinstalling Windows?