I have a crappy computer that is about 4 years old. Its a black macbook. It has 30.88 Gb of memory left and about 20-23 Gb left after I install Team Fortress 2. I close every app, and set all the details and graphics on low, but it takes forever to load and then when it gets to the end it just crashes. It does the same with Garry's Mod. How do I fix, and if I cant' Im getting a new computer soon. Thanks