Help with blender closing.

Whenever I go in weight paint mode to touch up on my character and fix the armature it won’t let me. Whenever I click to add some weight paint a window pops up saying “blender has stopped working” and under it a button that says “close program”. Why is it doing this? It only seems to happen in my one file. I try moving it to a different empty layer thinking how I have a crappy computer and maybe its too much for my pc but that still doesn’t work. Sorry if this is the wrong forum spot for the question.