How can I keep blender from freezing whenever I try to render or bake a somewhat heavy scene in my no good very bad computer? Well, I'm trying to render a simple chest, that's all, but it has some high definition textures and the vertex count is very high with SubSurf. I can work fine in the 3Dview, the thing is whenever I try to render my humble chest Blender flips the heck out and starts doing some very time consuming calculations, then RAM use go waaaay up and my whole pc freezes and never comes back A La Chavo del Ocho so I have to turn my PC off and on again. Then I thought, well I just have bake the textures that are causing this and the render will go fine. Well, I was wrong yet again and my PC freezes again, and the weirdest thing, when I use 1000 samples in the bake blender crashes after some time and my computer comes back, but when I use 200 it never comes back. My computer is very bad: 
Intel Core i3 3110M 2.40GHz
8gb DDR3 memory(dual 4096 MBytes)
Intel HD Graphics 4000 
Windows 10 Pro 64bits Laptop

I was under the impression that the only thing that was gonna happen were very long renders and that would be fine but now i'm afraid and sad that I need a new computer to go on with my studies and right now I cant. What can I do? Do I have to just do simple works while I wait to buy new hardware?
The most likely reason for such a crash is running out of memory - and for what you describe as a simple scene you should not be running out of memory. 

In order to reduce the memory requirement for your scene you could try reducing the size of your textures, simplify your mesh, reduce the level of subdivision surface modifiers (there are separate settings for Preview and Render - check both) and check for other modifiers that generate geometry (for example, a Remesh modifier can easily become a problem if set too high).

Simplify the scene and objects until you get a working render and then start adding complexity again until you find the cause.