1 Logon to Windows 8 computer with account that has administrative privileges.
2 Click on Start button and from the available options click on Control Panel.
3 On the opened Window click on More Settings from the list in the left bar.
4 On the next Window click on Power Options icon.
5 On Select a power plan Window click on Change plan settings link in front of the category which is selected by the radio button, for example Balanced (recommended) in this example.
6 On next Window click on Change advanced power settings link.
6 On Power Options box expand Sleep from the available list and then expand Sleep after.
7 Click on the available link and in Settings (Minutes) field input value 0 to disable sleep completely.
8 Click on Ok button when done.