Rendering Project crashes my computer

Every time I try to render my project (1200 frames, 1 sound, a few transparencies) it crashes my computer so that it only shows a blank screen and I can’t do anything but hold the power button until it shuts down and start over. It didn’t do this before, and I’m using a windows 10 computer and such, and I really don’t know what to do, as it’s for a project due at six tonight (mountain time). Please help! And please hurry!

Render them out as a png sequence, about 100 frames at a time, then let pc cool and do it again. Then assemble all frames in premier.