This tutorial will guide you to clear all Application History in Windows 8.
As we keep on using windows 8, Application cache and history will be kept in temperory memory.
It is recommended that you clean the history every so often to tidy up the system and therefore improve the system speed.

Step 1:
Click on Windows 8 start button and Select control panel icon.

Step 2:
Select Privacy

Step 3:
In Privacy Scroll down until you see Delete history. Click on this button.

Step 4:
Open Task manager by either use combo: ctrl + alt + delete or right click on Windows 8 task-bar and Select Start Task Manager from drop dowm menu.

Step 5:
click on More details at bottom of the screen. Then click on App history tab.

Under this tab, Click on Reset usage data. All apps which were running will be closed and all datas like CPU time and other data will be reset.