My PC keeps crashing when im editing on after effects. This results in my files getting corrupt.

Yesterday, i started to create a halloween edit. I used Element 3d and made a high quality intro for the edit, then my PC crashed, then again and did it 6 times. On the last time, i went on and went onto after effects and it said; Error with file. - This edit took 6 hours and now its gone. 

This is what it looked like -

Today, i go onto AE, and i start the edit again. This time i do the main edit, not a problem. I start the intro and open element. Make it look nice -

and it crashes a total of 3 or 4 times. On the last time, it says :

So i go onto After effects, and i see this:

I go onto my files, most recent save of the file was 5 mintues before it crashed, i open it and it doesn't open. Then the ones from about 2 hours before do open. but they got no useful work in.

Do i need a better CPU, if so what is recommended?