It may not be corrupt just a messed up font. Try changing the font of the messed up text and see if that clears it up. If not you can try the repair option
To open a specific document by using the Open and Repair feature in Word, follow these steps:
On the File menu, click Open.
Note In Word 2007 or Word 2010, click the Microsoft Office Button, and then click Open.
In the Open dialog box, click to select the file that you want to open.
Click the down arrow on the Open button, and then click Open and Repair.