Don’t Panic! is a free and portable Windows application that makes it easy to quickly hide windows, clear document and browser history, and otherwise mask your goofing off.
It includes options for hiding and closing applications, clearing browser history as well as recent clearing the Recent Documents menu and the Recycle Bin. Application closure/hiding is governed by as simple blacklist; populate the blacklist and hit the panic button (or the user-customizable panic button shortcut, CTRL+P by default).
Don’t Panic! is free portable application, Windows only. Hit up the link below to read more and grab a copy.
Don’t Panic! [Portable Apps]