So I have a problem. I've installed neocomplete for vim and whenever it completes something for me, it leaves vim with that popup:
It's at the top of the vim screen, and it stays here, ESCAPE doesn't work for it. Is there a way to close this up, or better -> disable this feature?

It's an actual window, so you'd close it like any other vim window (switch to it and
:q, use:on, etc...). To disable this feature, addset completeopt-=previewto your vimrc and restart vim/resource your vimrc.