To have a professional document, it would be better to type a well organized and clear text without fault. Even if Windows has a feature for identifying typing errors, there are many words you do not see in its dictionary. To be sure, the best thing to do is to use a software such as CT Quick Spell.
CT Quick Spell is a spell checker for Microsoft Word. It has been designed to check quickly the spelling of words or the whole document without opening a bulky program. Depending on you, it is possible to type directly the word in the program interface or copy and paste from an external document. To use this program, it is necessary t install Microsoft Word.