Here is something I learned today--you can change the Dictionary in Microsoft Word 2010 to a language such as Nicaraguan Spanish (for example) so that it will do a spell check for you of what you have written in Spanish. It puts in all the little accent marks and everything.
Type a few lines so that there is some to spell check.
Select the Review Tab
Spelling and Grammar from the Proofing Group
Add Additional Editing Languages (dropdown)
Select Spelling and Grammar from the Review Tab/Proofing Group