There is issue in Word 2007 that spell check is not working. I searched all lot for this but didn’t find any proper and working solution. Now I find its solution, it is working at my end and hope it will helpful for other too.
Following are simple step to accomplish it.

1. Click on Office Icon that is in top left corner
2. Click on “Word Option” that is first button at bottom right
   
3. In appeared dialog box click on “Customize”, there will be two panels, in left panel, scroll down to get “Spelling & Grammar” double click on it or single click and then click on Add button. “Spelling & Grammar” will goes in right panel.
   
4. Click Ok. Now you can check spell check is working. Write any misspelled word hope it will under line with red line right click on it you will see few suggestions and also there will be “Spelling” option in it.
   

Hope it will help.