Question: Since there's no longer a taskbar/start menu Control Panel, how do you clear the history of the Run box in Windows 8?

Answer: 
This did it for me

```
rundll32 inetcpl.cpl ClearMyTracksByProcess 1

```

[Clear History From the Command Line](http://howtogeek.com/howto/windows/clear-ie7-browsing-history-from-the-command-line)
For some reason the run box history is cleared via clearing Internet Explorer history. In IE, press ctrl+shift+del, and clear your history.