Click Start, Settings, Personalization
Click Start, scroll down to Show recently opened items in Jump Lists on Start or the taskbar. Select Off

Manually Clear Jump Lists:

Go to %APPDATA%\Microsoft\Windows\Recent\AutomaticDestinations

Delete Program’s Jump List (see below link)
e.g. recent Excel 2010 list – 9839aec31243a928

Reference:
http://www.online-tech-tips.com/computer-tips/clear-recent-items-windows-jumplists/

List of Jump List IDs:
http://www.forensicswiki.org/wiki/List_of_Jump_List_IDs

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