Word 2007 and 2013
1. Open your affected word document
2. Click “Review” à “Track Changes” à “Changes Tracking Options”
3. Make the changes as shown in below
4. Now your document will become normal as before
Word 2003
1. Open your affected word document
2. Click “Tools” à “Options” à “Track changes”
3. Make the changes as shown in below
4. Now your document will become normal as before