My spell check on my word document has stopped working. What should I do?

I was typing up a report in my word document, when I got to a word I was having difficulty with, I knew I was spelling it wrong, but my spell checker wasn't underlining it, and when I looked down at the symbol on the bottom of the page, next to the word count and page count, it had a blue check mark on it, but since I had spelled something wrong, it should have had a red x, which it didn't. So I go to my language settings, and I go to my "set proofing language" and I click on it and low and behold there is a check mark next to the option "do not check spelling and grammar". I am sitting there going "wtf" and I unmark the option and click ok. But my spell checker is still not working, so I go back to my "set proofing language" and by God, the option for "do not check spelling or grammar" is once again set. I unmark it yet again, but this time I click set as default, thinking that it might help. Every time, I get done resetting it, it reverts back to "do not check spelling or grammar", and it refuses to check my spelling. Could you help me get my spell checker working again?