Try right clicking the entry and "remove from list" This works in Office 2010 anyway so I'm guessing it will in 2007.
If not download Ccleaner and run that but it will remove all recent document lists.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?