Software for writing novels

I've written three books using CDraw because it was easy to set the page up to mimic the pages in print, but I had problems with spell checking, find/replace text, etc in chapters beyond 15 or so pages. Is there anybody who has written a novel (80k+ words) and can recommend a decent piece of software? I'm not looking for bells and whistles or anything that employs templates, just a straightforward writing environment on a Windows laptop. Grammar check is a must as I seem to be word blind to what's actually typed! Not MS Word, please!