Windows Vista - http://www.vistaarticles.com
Start Menu Privacy
http://www.vistaarticles.com/articles/58/1/Start-Menu-Privacy
By 
Published on 08/20/2006
 
Every time you open up a document or launch a program Windows Vista keeps track of this information to build the list of application for recently run applications and recent documents list.
Start Menu Privacy
1. Right click on the taskbar and select Properties.
2. Click on the Start Menu tab.
3. Uncheck Store and display a list of recently opened files.
4. Uncheck Store and display a list of recently opened programs.
5. Hit OK and you are finished.